(ignored inputs)COMMENT Example 6.2.7 of \cite{BN98}
Rewrite Rules:
   [ f(f(?x)) -> g(?x) ]
Apply Direct Methods...
Inner CPs:
   [ f(g(?x)) = g(f(?x)) ]
Outer CPs:
   [  ]
not Overlay, check Termination...
Terminating, not WCR
Knuth&Bendix
Direct Methods: not CR

Final result: not CR
/local-scratch/hzankl/2012/cops2012/7.trs: Success(not CR)
(1 msec.)