TRS: { a__from(X) -> cons(mark(X), from(s(X))), a__head(cons(X, XS)) -> mark(X), a__2nd(cons(X, XS)) -> a__head(mark(XS)), a__take(0(), XS) -> nil(), a__take(s(N), cons(X, XS)) -> cons(mark(X), take(N, XS)), a__sel(0(), cons(X, XS)) -> mark(X), a__sel(s(N), cons(X, XS)) -> a__sel(mark(N), mark(XS)), mark(from(X)) -> a__from(mark(X)), mark(head(X)) -> a__head(mark(X)), mark(2nd(X)) -> a__2nd(mark(X)), mark(take(X1, X2)) -> a__take(mark(X1), mark(X2)), mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2)), mark(cons(X1, X2)) -> cons(mark(X1), X2), mark(s(X)) -> s(mark(X)), mark(0()) -> 0(), mark(nil()) -> nil(), a__from(X) -> from(X), a__head(X) -> head(X), a__2nd(X) -> 2nd(X), a__take(X1, X2) -> take(X1, X2), a__sel(X1, X2) -> sel(X1, X2)} Fail