MAYBE
MAYBE
TRS:
 {
     a__f(X, g(X), Y) -> a__f(Y, Y, Y),
     a__f(X1, X2, X3) -> f(X1, X2, X3),
              a__g(X) -> g(X),
            a__g(b()) -> c(),
               a__b() -> c(),
               a__b() -> b(),
           mark(g(X)) -> a__g(mark(X)),
            mark(c()) -> c(),
            mark(b()) -> a__b(),
  mark(f(X1, X2, X3)) -> a__f(X1, X2, X3)
 }
 DUP: We consider a duplicating system.
  Trs:
   {
       a__f(X, g(X), Y) -> a__f(Y, Y, Y),
       a__f(X1, X2, X3) -> f(X1, X2, X3),
                a__g(X) -> g(X),
              a__g(b()) -> c(),
                 a__b() -> c(),
                 a__b() -> b(),
             mark(g(X)) -> a__g(mark(X)),
              mark(c()) -> c(),
              mark(b()) -> a__b(),
    mark(f(X1, X2, X3)) -> a__f(X1, X2, X3)
   }
  Fail