MAYBE
(ignored inputs)COMMENT [111] p. 29 ( GNFP & ~NFP & ~GCR )
Rewrite Rules:
   [ a -> b,
     f(b,b) -> f(a,a),
     f(?x,a) -> f(a,a) ]
Apply Direct Methods...
Inner CPs:
   [ f(?x,b) = f(a,a) ]
Outer CPs:
   [  ]
Linear
(inner) Parallel CPs: (not computed)
unknown Toyama (Parallel CPs)
Direct Methods: Can't judge

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