MAYBE
(ignored inputs)COMMENT Cops #647 - #721: generated ground TRSs; evenly distributed in the UNR/UNC/NFP/CR hierarchy submitted by: Bertram Felgenhauer
input TRS:
   [ h(f(b),a) -> h(f(h(c,a)),f(a)),
     c -> f(c),
     c -> h(f(b),c),
     a -> c,
     f(a) -> b ]
TRS:
   [ h(f(b),a) -> h(f(h(c,a)),f(a)),
     c -> f(c),
     c -> h(f(b),c),
     a -> c,
     f(a) -> b ]
Check distinct normal forms in critical pair closure...failed
problems/657.trs: Failure(unknown UNC)
(4 msec.)