MAYBE
(ignored inputs)COMMENT TPDB SRS_Standard/Zantema_04/z110
input TRS:
   [ a(a(?x)) -> b(?x),
     b(a(?x)) -> a(b(?x)),
     b(b(c(?x))) -> c(a(?x)),
     b(b(?x)) -> a(a(a(?x))),
     c(a(?x)) -> b(a(c(?x))) ]
TRS:
   [ a(a(?x)) -> b(?x),
     b(a(?x)) -> a(b(?x)),
     b(b(c(?x))) -> c(a(?x)),
     b(b(?x)) -> a(a(a(?x))),
     c(a(?x)) -> b(a(c(?x))) ]
Check distinct normal forms in critical pair closure...failed
problems/986.trs: Failure(unknown UNC)
(4 msec.)