MAYBE
MAYBE
TRS:
 {
                         mark(nil()) -> nil(),
                  mark(cons(X1, X2)) -> cons(mark(X1), X2),
                   mark(app(X1, X2)) -> a__app(mark(X1), mark(X2)),
                       mark(from(X)) -> a__from(mark(X)),
                          mark(s(X)) -> s(mark(X)),
                 mark(zWadr(X1, X2)) -> a__zWadr(mark(X1), mark(X2)),
                     mark(prefix(X)) -> a__prefix(mark(X)),
                      a__app(X1, X2) -> app(X1, X2),
                   a__app(nil(), YS) -> mark(YS),
             a__app(cons(X, XS), YS) -> cons(mark(X), app(XS, YS)),
                          a__from(X) -> cons(mark(X), from(s(X))),
                          a__from(X) -> from(X),
                 a__zWadr(XS, nil()) -> nil(),
                    a__zWadr(X1, X2) -> zWadr(X1, X2),
                 a__zWadr(nil(), YS) -> nil(),
  a__zWadr(cons(X, XS), cons(Y, YS)) ->
  cons(a__app(mark(Y), cons(mark(X), nil())), zWadr(XS, YS)),
                        a__prefix(X) -> prefix(X),
                        a__prefix(L) -> cons(nil(), zWadr(L, prefix(L)))
 }
 DUP: We consider a duplicating system.
  Trs:
   {
                           mark(nil()) -> nil(),
                    mark(cons(X1, X2)) -> cons(mark(X1), X2),
                     mark(app(X1, X2)) -> a__app(mark(X1), mark(X2)),
                         mark(from(X)) -> a__from(mark(X)),
                            mark(s(X)) -> s(mark(X)),
                   mark(zWadr(X1, X2)) -> a__zWadr(mark(X1), mark(X2)),
                       mark(prefix(X)) -> a__prefix(mark(X)),
                        a__app(X1, X2) -> app(X1, X2),
                     a__app(nil(), YS) -> mark(YS),
               a__app(cons(X, XS), YS) -> cons(mark(X), app(XS, YS)),
                            a__from(X) -> cons(mark(X), from(s(X))),
                            a__from(X) -> from(X),
                   a__zWadr(XS, nil()) -> nil(),
                      a__zWadr(X1, X2) -> zWadr(X1, X2),
                   a__zWadr(nil(), YS) -> nil(),
    a__zWadr(cons(X, XS), cons(Y, YS)) ->
    cons(a__app(mark(Y), cons(mark(X), nil())), zWadr(XS, YS)),
                          a__prefix(X) -> prefix(X),
                          a__prefix(L) -> cons(nil(), zWadr(L, prefix(L)))
   }
  Fail