YES
(ignored inputs)COMMENT Cops #647 - #721: generated ground TRSs; evenly distributed in the UNR/UNC/NFP/CR hierarchy submitted by: Bertram Felgenhauer
Input:
   [ f(c) -> a,
     f(a) -> c,
     c -> f(h(a,h(f(c),c))),
     h(f(c),f(b)) -> f(h(a,c)) ]

Make it flat:
   [ h(!cl_0,!cl_1) -> f(!cr_3),
     f(b) -> !cl_1,
     f(c) -> !cl_0,
     !cl_0 -> !cl_0,
     !cl_0 -> a,
     f(a) -> c,
     !cr_0 -> f(c),
     !cr_1 -> h(!cr_0,c),
     !cr_2 -> h(a,!cr_1),
     c -> f(!cr_2),
     !cr_3 -> h(a,c) ]
Time: 0.000 [s]

Make it Complete (R^):
   [ f(!cr_1) = h(!cl_0,!cl_1),
     h(a,!cl_1) = f(!cr_3),
     h(a,!cl_1) = f(!cr_1),
     f(!cr_1) = f(!cr_3),
     f(!cr_1) = h(!cr_0,!cl_1),
     h(a,!cl_1) = h(!cr_0,!cl_1),
     h(a,!cl_1) = h(!cl_0,!cl_1),
     h(!cr_0,!cl_1) = h(!cl_0,!cl_1),
     h(!cr_0,!cl_1) = f(!cr_3),
     h(!cl_0,!cl_1) = f(!cr_3),
     f(b) = !cl_1,
     a = f(c),
     h(!cl_0,c) = !cr_1,
     !cr_0 = a,
     f(!cr_0) = f(!cr_2),
     f(!cr_0) = f(a),
     f(!cr_0) = f(!cl_0),
     f(!cr_0) = c,
     h(!cr_0,!cr_1) = !cr_2,
     h(!cr_0,!cr_1) = h(a,!cr_1),
     h(!cr_0,c) = !cr_3,
     h(!cl_0,c) = h(!cr_0,c),
     h(a,!cr_3) = !cr_2,
     h(!cl_0,!cr_3) = !cr_2,
     h(a,!cr_3) = h(!cl_0,!cr_1),
     h(!cl_0,!cr_1) = h(!cl_0,!cr_3),
     h(a,!cr_3) = h(!cl_0,!cr_3),
     h(a,!cr_3) = h(a,!cr_1),
     h(!cl_0,!cr_1) = h(!cr_0,!cr_3),
     h(a,!cr_3) = h(!cr_0,!cr_3),
     h(!cr_0,!cr_3) = !cr_2,
     h(a,!cr_3) = h(!cr_0,!cr_1),
     h(!cr_0,!cr_3) = h(!cr_0,!cr_1),
     h(!cl_0,!cr_1) = h(!cr_0,!cr_1),
     h(!cr_0,!cr_1) = h(!cl_0,!cr_3),
     h(!cr_0,!cr_3) = h(!cl_0,!cr_3),
     h(!cr_0,!cr_3) = h(a,!cr_1),
     h(!cl_0,!cr_3) = h(a,!cr_1),
     !cr_1 = !cr_3,
     h(a,c) = !cr_1,
     h(!cr_0,c) = h(a,c),
     !cl_0 = !cr_0,
     f(c) = !cl_0,
     h(!cl_0,c) = h(a,c),
     h(!cl_0,c) = !cr_3,
     h(!cl_0,!cr_1) = h(a,!cr_1),
     h(!cl_0,!cr_1) = !cr_2,
     f(!cl_0) = c,
     f(!cl_0) = f(a),
     f(!cl_0) = f(!cr_2),
     !cl_0 = a,
     f(a) = f(!cr_2),
     f(a) = c,
     !cr_0 = f(c),
     !cr_1 = h(!cr_0,c),
     !cr_2 = h(a,!cr_1),
     c = f(!cr_2),
     !cr_3 = h(a,c) ]
Time: 0.023 [s]

CPNF:
   [ b … b,
     !cl_1 … !cl_1,
     !cl_0 … a ]
Time: 0.000 [s]

Now checking all the pairs in CW...

Time to check pairs: 0.000 [s]

The TRS has Uniqueness of Normal Forms.
Total Time: 0.025 [s]

problems/663.trs: Success(UNC)
real 0.04
user 0.03
sys 0.00