MAYBE
(ignored inputs)COMMENT [120] Example 3 submitted by: Aart Middeldorp
Rewrite Rules:
   [ g(?x) -> h(k(?x)),
     g(?x) -> ?x,
     h(k(?x)) -> f(?x),
     f(?x) -> ?x,
     k(c) -> c,
     f(c) -> g(c) ]
Apply Direct Methods...
Inner CPs:
   [ h(c) = f(c) ]
Outer CPs:
   [ h(k(?x)) = ?x,
     c = g(c) ]
Linear
(inner) Parallel CPs: (not computed)
unknown Toyama (Parallel CPs)
Direct Methods: Can't judge

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