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

Combined result: not CR
/tmp/fileOb2G29.trs: Success(not CR)
(0 msec.)