MAYBE
(ignored inputs)COMMENT submitted by: Johannes Waldmann
Rewrite Rules:
   [ b(b(?x)) -> c(a(?x)),
     c(a(?x)) -> b(b(?x)),
     c(a(?x)) -> a(b(?x)),
     a(b(?x)) -> b(b(?x)),
     c(b(?x)) -> a(b(?x)),
     a(c(?x)) -> c(c(?x)),
     c(b(?x)) -> b(b(?x)) ]
Apply Direct Methods...
Inner CPs:
   [ c(b(b(?x_3))) = b(b(b(?x_3))),
     c(c(c(?x_5))) = b(b(c(?x_5))),
     c(b(b(?x_3))) = a(b(b(?x_3))),
     c(c(c(?x_5))) = a(b(c(?x_5))),
     a(c(a(?x))) = b(b(b(?x))),
     c(c(a(?x))) = a(b(b(?x))),
     a(b(b(?x_1))) = c(c(a(?x_1))),
     a(a(b(?x_2))) = c(c(a(?x_2))),
     a(a(b(?x_4))) = c(c(b(?x_4))),
     a(b(b(?x_6))) = c(c(b(?x_6))),
     c(c(a(?x))) = b(b(b(?x))),
     b(c(a(?x))) = c(a(b(?x))) ]
Outer CPs:
   [ b(b(?x_1)) = a(b(?x_1)),
     a(b(?x_4)) = b(b(?x_4)) ]
Linear
(inner) Parallel CPs: (not computed)
unknown Toyama (Parallel CPs)
Direct Methods: Can't judge

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