MAYBE
MAYBE
TRS:
 {
                      mark(2nd(X)) -> active(2nd(mark(X))),
                mark(cons(X1, X2)) -> active(cons(mark(X1), X2)),
                     mark(from(X)) -> active(from(mark(X))),
                        mark(s(X)) -> active(s(mark(X))),
  active(2nd(cons(X, cons(Y, Z)))) -> mark(Y),
                   active(from(X)) -> mark(cons(X, from(s(X)))),
                      2nd(mark(X)) -> 2nd(X),
                    2nd(active(X)) -> 2nd(X),
                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)
 }
 DUP: We consider a duplicating system.
  Trs:
   {
                        mark(2nd(X)) -> active(2nd(mark(X))),
                  mark(cons(X1, X2)) -> active(cons(mark(X1), X2)),
                       mark(from(X)) -> active(from(mark(X))),
                          mark(s(X)) -> active(s(mark(X))),
    active(2nd(cons(X, cons(Y, Z)))) -> mark(Y),
                     active(from(X)) -> mark(cons(X, from(s(X)))),
                        2nd(mark(X)) -> 2nd(X),
                      2nd(active(X)) -> 2nd(X),
                  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)
   }
  Fail