MAYBE
(ignored inputs)COMMENT TPDB SRS_Standard/Zantema_04/z108
Rewrite Rules:
   [ a(a(?x)) -> b(c(?x)),
     b(b(?x)) -> c(d(?x)),
     c(c(?x)) -> d(d(d(?x))),
     d(d(d(?x))) -> a(c(?x)) ]
Apply Direct Methods...
Inner CPs:
   [ a(b(c(?x))) = b(c(a(?x))),
     b(c(d(?x))) = c(d(b(?x))),
     c(d(d(d(?x)))) = d(d(d(c(?x)))),
     d(a(c(?x))) = a(c(d(?x))),
     d(d(a(c(?x)))) = a(c(d(d(?x)))) ]
Outer CPs:
   [  ]
Linear
(inner) Parallel CPs: (not computed)
unknown Toyama (Parallel CPs)
Direct Methods: Can't judge

Combined result: Can't judge
943.trs: Failure(unknown CR)
(0 msec.)