MAYBE
MAYBE
TRS:
 {
                mark(cons(X1, X2)) -> active(cons(mark(X1), X2)),
                     mark(from(X)) -> active(from(mark(X))),
                        mark(s(X)) -> active(s(mark(X))),
               mark(after(X1, X2)) -> active(after(mark(X1), mark(X2))),
                         mark(0()) -> active(0()),
                cons(X1, mark(X2)) -> cons(X1, X2),
              cons(X1, active(X2)) -> cons(X1, X2),
                cons(mark(X1), X2) -> cons(X1, X2),
              cons(active(X1), X2) -> cons(X1, X2),
                     from(mark(X)) -> from(X),
                   from(active(X)) -> from(X),
                        s(mark(X)) -> s(X),
                      s(active(X)) -> s(X),
                   active(from(X)) -> mark(cons(X, from(s(X)))),
  active(after(s(N), cons(X, XS))) -> mark(after(N, XS)),
            active(after(0(), XS)) -> mark(XS),
               after(X1, mark(X2)) -> after(X1, X2),
             after(X1, active(X2)) -> after(X1, X2),
               after(mark(X1), X2) -> after(X1, X2),
             after(active(X1), X2) -> after(X1, X2)
 }
 DUP: We consider a duplicating system.
  Trs:
   {
                  mark(cons(X1, X2)) -> active(cons(mark(X1), X2)),
                       mark(from(X)) -> active(from(mark(X))),
                          mark(s(X)) -> active(s(mark(X))),
                 mark(after(X1, X2)) -> active(after(mark(X1), mark(X2))),
                           mark(0()) -> active(0()),
                  cons(X1, mark(X2)) -> cons(X1, X2),
                cons(X1, active(X2)) -> cons(X1, X2),
                  cons(mark(X1), X2) -> cons(X1, X2),
                cons(active(X1), X2) -> cons(X1, X2),
                       from(mark(X)) -> from(X),
                     from(active(X)) -> from(X),
                          s(mark(X)) -> s(X),
                        s(active(X)) -> s(X),
                     active(from(X)) -> mark(cons(X, from(s(X)))),
    active(after(s(N), cons(X, XS))) -> mark(after(N, XS)),
              active(after(0(), XS)) -> mark(XS),
                 after(X1, mark(X2)) -> after(X1, X2),
               after(X1, active(X2)) -> after(X1, X2),
                 after(mark(X1), X2) -> after(X1, X2),
               after(active(X1), X2) -> after(X1, X2)
   }
  Fail