NO
(ignored inputs)COMMENT reduction failed
Rewrite Rules:
   [ a -> b,
     f(?x,a) -> b,
     f(b,b) -> b ]
Apply Direct Methods...
Inner CPs:
   [ f(?x,b) = b ]
Outer CPs:
   [  ]
not Overlay, check Termination...
Terminating, not WCR
Knuth & Bendix
Direct Methods: not CR

Combined result: not CR
/tmp/fileOV77HA.trs: Success(not CR)
(0 msec.)