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