MAYBE
(ignored inputs)COMMENT doi:10.1007/s10817-011-9238-x [33] Example 8
input TRS:
   [ f(a,a) -> c,
     f(b,?x) -> f(?x,?x),
     f(?x,b) -> f(?x,?x),
     a -> b ]
TRS:
   [ f(a,a) -> c,
     f(b,?x) -> f(?x,?x),
     f(?x,b) -> f(?x,?x),
     a -> b ]
Check distinct normal forms in critical pair closure...failed
problems/113.trs: Failure(unknown UNC)
(4 msec.)