MAYBE
*** Computating Strongly Quasi-Reducible Parts ***
TRS:
   [ len(nil) -> 0,
     len(cons(?x,?xs)) -> s(len(?xs)),
     rev(nil) -> nil,
     rev(cons(?x,?xs)) -> app(rev(?xs),cons(?x,nil)),
     app(nil,?ys) -> ?ys,
     app(cons(?x,?xs),?ys) -> cons(?x,app(?xs,?ys)),
     len(rev(?xs)) -> len(?xs) ]
Constructors: {0,s,nil,cons}
Defined function symbols: {app,len,rev}
Constructor subsystem:
   [ ]
Rule part & Conj Part:
   [ len(nil) -> 0,
     len(cons(?x,?xs)) -> s(len(?xs)),
     rev(nil) -> nil,
     rev(cons(?x,?xs)) -> app(rev(?xs),cons(?x,nil)),
     app(nil,?ys) -> ?ys,
     app(cons(?x,?xs),?ys) -> cons(?x,app(?xs,?ys)) ]
   [ len(rev(?xs)) -> len(?xs) ]
Trying with:
R:
   [ len(nil) -> 0,
     len(cons(?x,?xs)) -> s(len(?xs)),
     rev(nil) -> nil,
     rev(cons(?x,?xs)) -> app(rev(?xs),cons(?x,nil)),
     app(nil,?ys) -> ?ys,
     app(cons(?x,?xs),?ys) -> cons(?x,app(?xs,?ys)) ]
E:
   [ len(rev(?xs)) = len(?xs) ]
*** Ground Confluence Check by Rewriting Induction ***
Sort: {Nat,List}
Signature:
   [ len : List -> Nat,
     rev : List -> List,
     app : List,List -> List,
     cons : Nat,List -> List,
     nil : List,
     s : Nat -> Nat,
     0 : Nat ]
Rule Part:
   [ len(nil) -> 0,
     len(cons(?x,?xs)) -> s(len(?xs)),
     rev(nil) -> nil,
     rev(cons(?x,?xs)) -> app(rev(?xs),cons(?x,nil)),
     app(nil,?ys) -> ?ys,
     app(cons(?x,?xs),?ys) -> cons(?x,app(?xs,?ys)) ]
Conjecture Part:
   [ len(rev(?xs)) = len(?xs) ]
Precedence (by weight): {(0,4),(s,0),(app,3),(len,7),(nil,5),(rev,6),(cons,2)}
Rule part is confluent.
R0 is ground confluent.
Check conj part consists of inductive theorems of R0.
Rules:
   [ len(nil) -> 0,
     len(cons(?x,?xs)) -> s(len(?xs)),
     rev(nil) -> nil,
     rev(cons(?x,?xs)) -> app(rev(?xs),cons(?x,nil)),
     app(nil,?ys) -> ?ys,
     app(cons(?x,?xs),?ys) -> cons(?x,app(?xs,?ys)) ]
Conjectures:
   [ len(rev(?xs)) = len(?xs) ]
STEP 0
ES:
   [ len(rev(?xs)) = len(?xs) ]
HS:
   [ ]
ES0:
   [ len(rev(?xs)) = len(?xs) ]
HS0:
   [ ]
ES1:
   [ len(rev(?xs)) = len(?xs) ]
HS1:
   [ ]
Expand len(rev(?xs)) = len(?xs)
   [ len(nil) = len(nil),
     len(app(rev(?xs_2),cons(?x_2,nil))) = len(cons(?x_2,?xs_2)) ]
ES2:
   [ 0 = len(nil),
     len(app(rev(?xs_2),cons(?x_2,nil))) = len(cons(?x_2,?xs_2)) ]
HS2:
   [ len(rev(?xs)) -> len(?xs) ]
STEP 1
ES:
   [ 0 = len(nil),
     len(app(rev(?xs_2),cons(?x_2,nil))) = len(cons(?x_2,?xs_2)) ]
HS:
   [ len(rev(?xs)) -> len(?xs) ]
ES0:
   [ 0 = 0,
     len(app(rev(?xs_2),cons(?x_2,nil))) = s(len(?xs_2)) ]
HS0:
   [ len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(rev(?xs_2),cons(?x_2,nil))) = s(len(?xs_2)) ]
HS1:
   [ len(rev(?xs)) -> len(?xs) ]
Expand len(app(rev(?xs_2),cons(?x_2,nil))) = s(len(?xs_2))
   [ len(app(nil,cons(?x,nil))) = s(len(nil)),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) = s(len(cons(?x_2,?xs_2))) ]
ES2:
   [ s(0) = s(len(nil)),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) = s(len(cons(?x_2,?xs_2))) ]
HS2:
   [ len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 2
ES:
   [ s(0) = s(len(nil)),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) = s(len(cons(?x_2,?xs_2))) ]
HS:
   [ len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(0) = s(0),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) = s(s(len(?xs_2))) ]
HS0:
   [ len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) = s(s(len(?xs_2))) ]
HS1:
   [ len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) = s(s(len(?xs_2)))
   [ len(app(app(nil,cons(?x_2,nil)),cons(?x,nil))) = s(s(len(nil))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(len(cons(?x_4,?xs_4)))) ]
ES2:
   [ s(s(0)) = s(s(len(nil))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(len(cons(?x_4,?xs_4)))) ]
HS2:
   [ len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 3
ES:
   [ s(s(0)) = s(s(len(nil))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(len(cons(?x_4,?xs_4)))) ]
HS:
   [ len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(0)) = s(s(0)),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(len(?xs_4)))) ]
HS0:
   [ len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(len(?xs_4)))) ]
HS1:
   [ len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(len(?xs_4))))
   [ len(app(app(app(nil,cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(len(nil)))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(len(cons(?x_6,?xs_6))))) ]
ES2:
   [ s(s(s(0))) = s(s(s(len(nil)))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(len(cons(?x_6,?xs_6))))) ]
HS2:
   [ len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 4
ES:
   [ s(s(s(0))) = s(s(s(len(nil)))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(len(cons(?x_6,?xs_6))))) ]
HS:
   [ len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(0))) = s(s(s(0))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(len(?xs_6))))) ]
HS0:
   [ len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(len(?xs_6))))) ]
HS1:
   [ len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(len(?xs_6)))))
   [ len(app(app(app(app(nil,cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(len(nil))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(len(cons(?x_8,?xs_8)))))) ]
ES2:
   [ s(s(s(s(0)))) = s(s(s(s(len(nil))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(len(cons(?x_8,?xs_8)))))) ]
HS2:
   [ len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 5
ES:
   [ s(s(s(s(0)))) = s(s(s(s(len(nil))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(len(cons(?x_8,?xs_8)))))) ]
HS:
   [ len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(0)))) = s(s(s(s(0)))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(len(?xs_8)))))) ]
HS0:
   [ len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(len(?xs_8)))))) ]
HS1:
   [ len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(len(?xs_8))))))
   [ len(app(app(app(app(app(nil,cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(len(nil)))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(len(cons(?x_10,?xs_10))))))) ]
ES2:
   [ s(s(s(s(s(0))))) = s(s(s(s(s(len(nil)))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(len(cons(?x_10,?xs_10))))))) ]
HS2:
   [ len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 6
ES:
   [ s(s(s(s(s(0))))) = s(s(s(s(s(len(nil)))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(len(cons(?x_10,?xs_10))))))) ]
HS:
   [ len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(0))))) = s(s(s(s(s(0))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(len(?xs_10))))))) ]
HS0:
   [ len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(len(?xs_10))))))) ]
HS1:
   [ len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(len(?xs_10)))))))
   [ len(app(app(app(app(app(app(nil,cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(len(nil))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(len(cons(?x_12,?xs_12)))))))) ]
ES2:
   [ s(s(s(s(s(s(0)))))) = s(s(s(s(s(s(len(nil))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(len(cons(?x_12,?xs_12)))))))) ]
HS2:
   [ len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 7
ES:
   [ s(s(s(s(s(s(0)))))) = s(s(s(s(s(s(len(nil))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(len(cons(?x_12,?xs_12)))))))) ]
HS:
   [ len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(0)))))) = s(s(s(s(s(s(0)))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(len(?xs_12)))))))) ]
HS0:
   [ len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(len(?xs_12)))))))) ]
HS1:
   [ len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(len(?xs_12))))))))
   [ len(app(app(app(app(app(app(app(nil,cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(len(nil)))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(len(cons(?x_14,?xs_14))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(0))))))) = s(s(s(s(s(s(s(len(nil)))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(len(cons(?x_14,?xs_14))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 8
ES:
   [ s(s(s(s(s(s(s(0))))))) = s(s(s(s(s(s(s(len(nil)))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(len(cons(?x_14,?xs_14))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(0))))))) = s(s(s(s(s(s(s(0))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(len(?xs_14))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(len(?xs_14))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(len(?xs_14)))))))))
   [ len(app(app(app(app(app(app(app(app(nil,cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(len(nil))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(len(cons(?x_16,?xs_16)))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(0)))))))) = s(s(s(s(s(s(s(s(len(nil))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(len(cons(?x_16,?xs_16)))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 9
ES:
   [ s(s(s(s(s(s(s(s(0)))))))) = s(s(s(s(s(s(s(s(len(nil))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(len(cons(?x_16,?xs_16)))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(0)))))))) = s(s(s(s(s(s(s(s(0)))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(len(?xs_16))))))))))
   [ len(app(app(app(app(app(app(app(app(app(nil,cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(len(nil)))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(len(cons(?x_18,?xs_18))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(0))))))))) = s(s(s(s(s(s(s(s(s(len(nil)))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(len(cons(?x_18,?xs_18))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 10
ES:
   [ s(s(s(s(s(s(s(s(s(0))))))))) = s(s(s(s(s(s(s(s(s(len(nil)))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(len(cons(?x_18,?xs_18))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(0))))))))) = s(s(s(s(s(s(s(s(s(0))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(len(?xs_18)))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(len(nil))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(len(cons(?x_20,?xs_20)))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(0)))))))))) = s(s(s(s(s(s(s(s(s(s(len(nil))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(len(cons(?x_20,?xs_20)))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 11
ES:
   [ s(s(s(s(s(s(s(s(s(s(0)))))))))) = s(s(s(s(s(s(s(s(s(s(len(nil))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(len(cons(?x_20,?xs_20)))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(0)))))))))) = s(s(s(s(s(s(s(s(s(s(0)))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(len(?xs_20))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_22,?xs_22))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(0))))))))))) = s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_22,?xs_22))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 12
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(0))))))))))) = s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_22,?xs_22))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(0))))))))))) = s(s(s(s(s(s(s(s(s(s(s(0))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22)))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_24,?xs_24)))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_24,?xs_24)))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 13
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_24,?xs_24)))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_26,?xs_26))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_26,?xs_26))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 14
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_26,?xs_26))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26)))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_28,?xs_28)))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_28,?xs_28)))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 15
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_28,?xs_28)))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_30,?xs_30))))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_30,?xs_30))))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 16
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_30,?xs_30))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30)))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_32,?xs_32)))))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_32,?xs_32)))))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 17
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_32,?xs_32)))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_34,?xs_34))))))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_34,?xs_34))))))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 18
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_34,?xs_34))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34)))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_36,?xs_36)))))))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_36,?xs_36)))))))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 19
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_36,?xs_36)))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36))))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_38,?xs_38))))))))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_38,?xs_38))))))))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 20
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_38,?xs_38))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
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ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))),
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HS0:
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ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))) ]
HS1:
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     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38)))))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_40,?xs_40)))))))))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_40,?xs_40)))))))))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 21
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_40,?xs_40)))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40))))))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_42,?xs_42))))))))))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_42,?xs_42))))))))))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 22
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_42,?xs_42))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42)))))))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_44,?xs_44)))))))))))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_44,?xs_44)))))))))))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 23
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_44,?xs_44)))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))) ]
HS0:
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ES1:
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HS1:
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Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44))))))))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_46,?xs_46))))))))))))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_46,?xs_46))))))))))))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 24
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_46,?xs_46))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
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ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))),
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HS0:
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ES1:
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HS1:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_46)))))))))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_48),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_48,?xs_48)))))))))))))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_48),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_48,?xs_48)))))))))))))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_46))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 25
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_48),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_48,?xs_48)))))))))))))))))))))))))) ]
HS:
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ES0:
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HS0:
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     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_48),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_48)))))))))))))))))))))))))) ]
HS1:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_46))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_48),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_48))))))))))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_50),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_50,?xs_50))))))))))))))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_50),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_50,?xs_50))))))))))))))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_48),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_48)))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_46))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 26
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_50),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_50,?xs_50))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_48),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_48)))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_46))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
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ES0:
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ES1:
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HS1:
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Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_50),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_50)))))))))))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))),
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ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))),
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 27
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_52),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_52,?xs_52)))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_50),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_50))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_48),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_48)))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_46))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_52),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_52)))))))))))))))))))))))))))) ]
HS0:
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ES1:
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Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_52),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_52))))))))))))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 28
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_54),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_54,?xs_54))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_52),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_52)))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_50),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_50))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_48),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_48)))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_46))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_54),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_54))))))))))))))))))))))))))))) ]
HS0:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_52),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_52)))))))))))))))))))))))))))),
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ES1:
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   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 29
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_56),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_56,?xs_56)))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_54),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_54))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_52),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_52)))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_50),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_50))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_48),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_48)))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_46))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
ES0:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))),
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ES1:
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HS1:
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 30
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_58),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_58,?xs_58))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_56),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_56)))))))))))))))))))))))))))))),
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ES1:
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HS1:
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     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_58),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_58)))))))))))))))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_60),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_60,?xs_60)))))))))))))))))))))))))))))))) ]
ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_60),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_60,?xs_60)))))))))))))))))))))))))))))))) ]
HS2:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_58),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_58))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_56),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_56)))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_54),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_54))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_52),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_52)))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_50),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_50))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_48),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_48)))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_46))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 31
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))),
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ES1:
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HS1:
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   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 32
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_62),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_62,?xs_62))))))))))))))))))))))))))))))))) ]
HS:
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ES1:
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HS1:
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ES2:
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HS2:
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     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 33
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))),
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HS:
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   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))),
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ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))),
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 34
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_66),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_66,?xs_66))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_64),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_64)))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_62),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_62))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_60),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_60)))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_58),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_58))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_56),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_56)))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_54),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_54))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_52),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_52)))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_50),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_50))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_48),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_48)))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_46))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
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     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_66),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_66)))))))))))))))))))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_46))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_36),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_36)))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 35
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_68),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_68,?xs_68)))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_66),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_66))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_64),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_64)))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_62),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_62))))))))))))))))))))))))))))))))),
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     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_68),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_68))))))))))))))))))))))))))))))))))))
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(nil,cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))),
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ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))),
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 36
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_70),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_70,?xs_70))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_68),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_68)))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_66),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_66))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_64),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_64)))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_62),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_62))))))))))))))))))))))))))))))))),
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HS1:
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ES2:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))),
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 37
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_72),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_72,?xs_72)))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_70),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_70))))))))))))))))))))))))))))))))))))),
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ES1:
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     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_72),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_72))))))))))))))))))))))))))))))))))))))
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 38
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_74),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_74,?xs_74))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_72),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_72)))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_70),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_70))))))))))))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 39
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_76),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_76,?xs_76)))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_74),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_74))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_72),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_72)))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_70),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_70))))))))))))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 40
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_78),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_78,?xs_78))))))))))))))))))))))))))))))))))))))))) ]
HS:
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 41
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_80),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_80,?xs_80)))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_78),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_78))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_76),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_76)))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_74),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_74))))))))))))))))))))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_70),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_70))))))))))))))))))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_66),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_66))))))))))))))))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
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     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 42
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_82),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_82,?xs_82))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_80),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_80)))))))))))))))))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 43
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_84),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_84,?xs_84)))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_82),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_82))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_80),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_80)))))))))))))))))))))))))))))))))))))))))),
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ES2:
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     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 44
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_86),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_86,?xs_86))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_84),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_84)))))))))))))))))))))))))))))))))))))))))))),
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Expand len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_86),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_86)))))))))))))))))))))))))))))))))))))))))))))
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ES2:
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HS2:
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     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 45
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_88),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_88,?xs_88)))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_86),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_86))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_84),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_84)))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_82),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_82))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_80),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_80)))))))))))))))))))))))))))))))))))))))))),
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ES1:
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HS1:
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
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     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 46
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_90),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_90,?xs_90))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
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ES1:
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HS1:
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     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 47
ES:
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ES1:
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 48
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_94),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_94,?xs_94))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_92),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_92)))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_90),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_90))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_88),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_88)))))))))))))))))))))))))))))))))))))))))))))),
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ES1:
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HS1:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 49
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_96),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_96,?xs_96)))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_94),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_94))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_92),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_92)))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_90),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_90))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_88),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_88)))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_86),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_86))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_84),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_84)))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_82),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_82))))))))))))))))))))))))))))))))))))))))))),
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ES1:
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HS1:
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ES2:
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HS2:
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     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 50
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_98),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_98,?xs_98))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_96),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_96)))))))))))))))))))))))))))))))))))))))))))))))))),
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ES2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 51
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_100),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_100,?xs_100)))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_98),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_98))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_96),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_96)))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_94),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_94))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_92),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_92)))))))))))))))))))))))))))))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_88),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_88)))))))))))))))))))))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 52
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_102),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_102,?xs_102))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_100),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_100)))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_98),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_98))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_96),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_96)))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_94),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_94))))))))))))))))))))))))))))))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_90),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_90))))))))))))))))))))))))))))))))))))))))))))))),
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ES2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 53
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_104),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_104,?xs_104)))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_102),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_102))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_100),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_100)))))))))))))))))))))))))))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 54
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_106),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_106,?xs_106))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_104),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_104)))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_102),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_102))))))))))))))))))))))))))))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_44),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_44)))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_42),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_42))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_40),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_40)))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_38),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_38))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_34),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_34))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 55
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_108),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_108,?xs_108)))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_106),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_106))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_104),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_104)))))))))))))))))))))))))))))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 56
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_110),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_110,?xs_110))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_108),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_108)))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_106),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_106))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 57
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_112),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_112,?xs_112)))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_110),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_110))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 58
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_114),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_114,?xs_114))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_112),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_112)))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_110),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_110))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_108),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_108)))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 59
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_116),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_116,?xs_116)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_114),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_114))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
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     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 60
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_118),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_118,?xs_118))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_116),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_116)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 61
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_120),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_120,?xs_120)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_118),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_118))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_116),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_116)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 62
ES:
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HS2:
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     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 63
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_124),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_124,?xs_124)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_122),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_122))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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ES2:
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     len(rev(?xs)) -> len(?xs) ]
STEP 64
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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HS:
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     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 65
ES:
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ES1:
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ES2:
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HS2:
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     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 66
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_130),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_130,?xs_130))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
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ES1:
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     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 67
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_132),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_132,?xs_132)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
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     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 68
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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HS:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 69
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_136),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_136,?xs_136)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
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ES1:
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     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 70
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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HS:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_46),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_46))))))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
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     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
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     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 71
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_140),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_140,?xs_140)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
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     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 72
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_142),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_142,?xs_142))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 73
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_144),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_144,?xs_144)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_142),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_142))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_140),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_140)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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ES1:
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     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
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     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 74
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_146),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_146,?xs_146))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
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     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
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     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 75
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_148),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_148,?xs_148)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_146),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_146))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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ES2:
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HS2:
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     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 76
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_150),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_150,?xs_150))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_148),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_148)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_146),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_146))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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HS2:
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     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 77
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_152),cons(?x_152,nil)),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_152,?xs_152)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_150),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_150))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_148),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_148)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 78
ES:
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ES1:
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ES2:
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HS2:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
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     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
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     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 79
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_156),cons(?x_156,nil)),cons(?x_154,nil)),cons(?x_152,nil)),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_156,?xs_156)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_154),cons(?x_154,nil)),cons(?x_152,nil)),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_154))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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ES1:
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     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 80
ES:
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     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 81
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_160),cons(?x_160,nil)),cons(?x_158,nil)),cons(?x_156,nil)),cons(?x_154,nil)),cons(?x_152,nil)),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_160,?xs_160)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_158),cons(?x_158,nil)),cons(?x_156,nil)),cons(?x_154,nil)),cons(?x_152,nil)),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_158))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_156),cons(?x_156,nil)),cons(?x_154,nil)),cons(?x_152,nil)),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_156)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_32),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_32)))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_30),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_30))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_28),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_28)))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_22),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_22))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
     len(app(app(app(app(app(app(app(app(app(rev(?xs_16),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(len(?xs_16)))))))))),
     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 82
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_162),cons(?x_162,nil)),cons(?x_160,nil)),cons(?x_158,nil)),cons(?x_156,nil)),cons(?x_154,nil)),cons(?x_152,nil)),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_162,?xs_162))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_160),cons(?x_160,nil)),cons(?x_158,nil)),cons(?x_156,nil)),cons(?x_154,nil)),cons(?x_152,nil)),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_160)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 83
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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HS:
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     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_26),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_26))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_24),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_24)))))))))))))),
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     len(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_20),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(len(?xs_20)))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(rev(?xs_18),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(len(?xs_18))))))))))),
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     len(app(app(app(app(app(app(app(app(rev(?xs_14),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(len(?xs_14))))))))),
     len(app(app(app(app(app(app(app(rev(?xs_12),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(len(?xs_12)))))))),
     len(app(app(app(app(app(app(rev(?xs_10),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(len(?xs_10))))))),
     len(app(app(app(app(app(rev(?xs_8),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(len(?xs_8)))))),
     len(app(app(app(app(rev(?xs_6),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(len(?xs_6))))),
     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 84
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_166),cons(?x_166,nil)),cons(?x_164,nil)),cons(?x_162,nil)),cons(?x_160,nil)),cons(?x_158,nil)),cons(?x_156,nil)),cons(?x_154,nil)),cons(?x_152,nil)),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_166,?xs_166))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
HS:
   [ len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_164),cons(?x_164,nil)),cons(?x_162,nil)),cons(?x_160,nil)),cons(?x_158,nil)),cons(?x_156,nil)),cons(?x_154,nil)),cons(?x_152,nil)),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(?xs_164)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
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ES2:
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     len(app(app(app(rev(?xs_4),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) -> s(s(s(len(?xs_4)))),
     len(app(app(rev(?xs_2),cons(?x_2,nil)),cons(?x,nil))) -> s(s(len(?xs_2))),
     len(app(rev(?xs_2),cons(?x_2,nil))) -> s(len(?xs_2)),
     len(rev(?xs)) -> len(?xs) ]
STEP 85
ES:
   [ s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(0)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(nil))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
     len(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(app(rev(?xs_168),cons(?x_168,nil)),cons(?x_166,nil)),cons(?x_164,nil)),cons(?x_162,nil)),cons(?x_160,nil)),cons(?x_158,nil)),cons(?x_156,nil)),cons(?x_154,nil)),cons(?x_152,nil)),cons(?x_150,nil)),cons(?x_148,nil)),cons(?x_146,nil)),cons(?x_144,nil)),cons(?x_142,nil)),cons(?x_140,nil)),cons(?x_138,nil)),cons(?x_136,nil)),cons(?x_134,nil)),cons(?x_132,nil)),cons(?x_130,nil)),cons(?x_128,nil)),cons(?x_126,nil)),cons(?x_124,nil)),cons(?x_122,nil)),cons(?x_120,nil)),cons(?x_118,nil)),cons(?x_116,nil)),cons(?x_114,nil)),cons(?x_112,nil)),cons(?x_110,nil)),cons(?x_108,nil)),cons(?x_106,nil)),cons(?x_104,nil)),cons(?x_102,nil)),cons(?x_100,nil)),cons(?x_98,nil)),cons(?x_96,nil)),cons(?x_94,nil)),cons(?x_92,nil)),cons(?x_90,nil)),cons(?x_88,nil)),cons(?x_86,nil)),cons(?x_84,nil)),cons(?x_82,nil)),cons(?x_80,nil)),cons(?x_78,nil)),cons(?x_76,nil)),cons(?x_74,nil)),cons(?x_72,nil)),cons(?x_70,nil)),cons(?x_68,nil)),cons(?x_66,nil)),cons(?x_64,nil)),cons(?x_62,nil)),cons(?x_60,nil)),cons(?x_58,nil)),cons(?x_56,nil)),cons(?x_54,nil)),cons(?x_52,nil)),cons(?x_50,nil)),cons(?x_48,nil)),cons(?x_46,nil)),cons(?x_44,nil)),cons(?x_42,nil)),cons(?x_40,nil)),cons(?x_38,nil)),cons(?x_36,nil)),cons(?x_34,nil)),cons(?x_32,nil)),cons(?x_30,nil)),cons(?x_28,nil)),cons(?x_26,nil)),cons(?x_24,nil)),cons(?x_22,nil)),cons(?x_20,nil)),cons(?x_18,nil)),cons(?x_16,nil)),cons(?x_14,nil)),cons(?x_12,nil)),cons(?x_10,nil)),cons(?x_8,nil)),cons(?x_6,nil)),cons(?x_4,nil)),cons(?x_2,nil)),cons(?x,nil))) = s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(s(len(cons(?x_168,?xs_168)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ]
rewriting induction stopped because of timeout.
new/len-rev.trs: Failure(unknown)
(5016 msec.)