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

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

Make it Complete (R^):
   [ h(c,c) = f(c),
     c = h(c,c),
     f(c) = c,
     a = f(b),
     f(a) = b,
     f(a) = a,
     f(a) = f(b),
     f(a) = h(!cr_0,!cr_1),
     f(b) = h(!cr_0,!cr_1),
     f(b) = b,
     h(c,a) = h(c,b),
     h(c,a) = !cr_1,
     b = h(!cr_0,!cr_1),
     h(a,b) = !cr_0,
     h(b,b) = !cr_0,
     h(a,b) = h(b,a),
     h(a,b) = h(b,b),
     h(b,a) = h(b,b),
     h(a,b) = h(a,a),
     h(b,b) = h(a,a),
     h(b,a) = h(a,a),
     h(b,a) = !cr_0,
     a = b,
     !cr_0 = h(a,a),
     !cr_1 = h(c,b),
     a = h(!cr_0,!cr_1) ]
Time: 0.006 [s]

CPNF:
   [ !cr_0 … h(b,b),
     a … b ]
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: 0.006 [s]

problems/688.trs: Success(UNC)
real 0.03
user 0.02
sys 0.01