NO
(ignored inputs)COMMENT reduction failed
Rewrite Rules:
   [ f(g(?x)) -> g(f(f(?x))),
     g(?x) -> ?x ]
Apply Direct Methods...
Inner CPs:
   [ f(?x_1) = g(f(f(?x_1))) ]
Outer CPs:
   [  ]
not Overlay, check Termination...
Terminating, not WCR
Knuth & Bendix
Direct Methods: not CR

Combined result: not CR
/tmp/fileEx7XGf.trs: Success(not CR)
(6 msec.)