MAYBE
(ignored inputs)COMMENT submitted by: Johannes Waldmann
input TRS:
   [ b(b(?x)) -> a(a(?x)),
     a(a(?x)) -> b(b(?x)),
     a(c(?x)) -> c(c(?x)),
     a(b(?x)) -> c(a(?x)),
     c(c(?x)) -> a(a(?x)),
     a(a(?x)) -> a(c(?x)) ]
TRS:
   [ b(b(?x)) -> a(a(?x)),
     a(a(?x)) -> b(b(?x)),
     a(c(?x)) -> c(c(?x)),
     a(b(?x)) -> c(a(?x)),
     c(c(?x)) -> a(a(?x)),
     a(a(?x)) -> a(c(?x)) ]
Check distinct normal forms in critical pair closure...failed
problems/990.trs: Failure(unknown UNC)
(4 msec.)