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

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

Make it Complete (R^):
   [ h(!cl_1,b) = c,
     h(!cl_0,b) = f(!cr_2),
     h(!cl_0,b) = b,
     h(c,c) = !cl_1,
     f(a) = !cl_0,
     !cr_0 = f(b),
     !cr_1 = f(!cr_0),
     !cr_2 = h(!cr_1,c),
     b = f(!cr_2) ]
Time: 0.001 [s]

CPNF:
   [ !cl_1 … !cl_1,
     a … a,
     !cl_0 … !cl_0,
     c … c ]
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: 0.002 [s]

problems/661.trs: Success(UNC)
real 0.04
user 0.02
sys 0.00