MAYBE
(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:
   [  ]
Linear
(inner) Parallel CPs: (not computed)
unknown Toyama (Parallel CPs)
Direct Methods: Can't judge

Combined result: Can't judge
9.trs: Failure(unknown CR)
(0 msec.)