MAYBE
(ignored inputs)COMMENT submitted by: Johannes Waldmann secret problem 2019 category: SRS
Rewrite Rules:
   [ b(?x) -> b(a(b(?x))),
     a(?x) -> c(a(a(?x))),
     b(?x) -> a(c(a(?x))),
     c(?x) -> c(a(c(?x))),
     b(?x) -> a(c(b(?x))) ]
Apply Direct Methods...
Inner CPs:
   [  ]
Outer CPs:
   [ b(a(b(?x))) = a(c(a(?x))),
     b(a(b(?x))) = a(c(b(?x))),
     a(c(a(?x_2))) = a(c(b(?x_2))) ]
Linear
(inner) Parallel CPs: (not computed)
unknown Toyama (Parallel CPs)
Direct Methods: Can't judge

Combined result: Can't judge
1131.trs: Failure(unknown CR)
(0 msec.)