MAYBE
(ignored inputs)COMMENT doi:10.1007/978-1-4757-3661-8 [18] Exercise 4.2.2 submitted by: Takahito Aoto , Junichi Yoshida , and Yoshihito Toyama
Rewrite Rules:
   [ b(w(?x)) -> w(w(w(b(?x)))),
     w(b(?x)) -> b(?x),
     b(b(?x)) -> w(w(w(w(?x)))),
     w(w(?x)) -> w(?x) ]
Apply Direct Methods...
Inner CPs:
   [ b(b(?x_1)) = w(w(w(b(b(?x_1))))),
     b(w(?x_3)) = w(w(w(b(w(?x_3))))),
     w(w(w(w(b(?x))))) = b(w(?x)),
     w(w(w(w(w(?x_2))))) = b(b(?x_2)),
     b(w(w(w(b(?x))))) = w(w(w(w(w(?x))))),
     w(b(?x_1)) = w(b(?x_1)),
     b(w(w(w(w(?x))))) = w(w(w(w(b(?x))))),
     w(w(?x)) = w(w(?x)) ]
Outer CPs:
   [  ]
Linear
(inner) Parallel CPs: (not computed)
unknown Toyama (Parallel CPs)
Direct Methods: Can't judge

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