YES
(ignored inputs)COMMENT doi:10.1109/LICS.2002.1029852 [25] Example 3 submitted by: Takahito Aoto , Junichi Yoshida , and Yoshihito Toyama
Rewrite Rules:
   [ f(a) -> f(f(a)),
     f(?x) -> f(a) ]
Apply Direct Methods...
Inner CPs:
   [  ]
Outer CPs:
   [ f(f(a)) = f(a) ]
Linear
(inner) Parallel CPs:
   [  ]
Toyama (Parallel CPs)
Direct Methods: CR

Combined result: CR
82.trs: Success(CR)
(0 msec.)