NO
(ignored inputs)COMMENT doi:10.1017/CBO9781139172752 [4] Exercise 6.4 submitted by: Takahito Aoto , Junichi Yoshida , and Yoshihito Toyama
Rewrite Rules:
   [ f(g(f(?x))) -> g(?x) ]
Apply Direct Methods...
Inner CPs:
   [ f(g(g(?x))) = g(g(f(?x))) ]
Outer CPs:
   [  ]
not Overlay, check Termination...
Terminating, not WCR
Knuth & Bendix
Direct Methods: not CR

Combined result: not CR
9.trs: Success(not CR)
(0 msec.)