MAYBE
MAYBE
TRS:
 {
  f(x, a(b(c(y)))) -> f(b(c(a(b(x)))), y),
        f(b(x), y) -> f(x, b(y)),
        f(c(x), y) -> f(x, c(y)),
        f(a(x), y) -> f(x, a(y))
 }
 DUP: We consider a non-duplicating system.
  Trs:
   {
    f(x, a(b(c(y)))) -> f(b(c(a(b(x)))), y),
          f(b(x), y) -> f(x, b(y)),
          f(c(x), y) -> f(x, c(y)),
          f(a(x), y) -> f(x, a(y))
   }
  Fail