TRS:
 {                     a__pairNs() -> cons(0(), incr(oddNs())),
                        a__oddNs() -> a__incr(a__pairNs()),
              a__incr(cons(X, XS)) -> cons(s(mark(X)), incr(XS)),
                  a__take(0(), XS) -> nil(),
        a__take(s(N), cons(X, XS)) -> cons(mark(X), take(N, XS)),
                 a__zip(nil(), XS) -> nil(),
                  a__zip(X, nil()) -> nil(),
  a__zip(cons(X, XS), cons(Y, YS)) -> cons(pair(mark(X), mark(Y)), zip(XS, YS)),
              a__tail(cons(X, XS)) -> mark(XS),
                a__repItems(nil()) -> nil(),
          a__repItems(cons(X, XS)) -> cons(mark(X), cons(X, repItems(XS))),
                    mark(pairNs()) -> a__pairNs(),
                     mark(incr(X)) -> a__incr(mark(X)),
                     mark(oddNs()) -> a__oddNs(),
                mark(take(X1, X2)) -> a__take(mark(X1), mark(X2)),
                 mark(zip(X1, X2)) -> a__zip(mark(X1), mark(X2)),
                     mark(tail(X)) -> a__tail(mark(X)),
                 mark(repItems(X)) -> a__repItems(mark(X)),
                mark(cons(X1, X2)) -> cons(mark(X1), X2),
                         mark(0()) -> 0(),
                        mark(s(X)) -> s(mark(X)),
                       mark(nil()) -> nil(),
                mark(pair(X1, X2)) -> pair(mark(X1), mark(X2)),
                       a__pairNs() -> pairNs(),
                        a__incr(X) -> incr(X),
                        a__oddNs() -> oddNs(),
                   a__take(X1, X2) -> take(X1, X2),
                    a__zip(X1, X2) -> zip(X1, X2),
                        a__tail(X) -> tail(X),
                    a__repItems(X) -> repItems(X)}
 Fail