(VAR X XS N X1 X2) (RULES from(X) -> cons(X,n__from(s(X))) head(cons(X,XS)) -> X 2nd(cons(X,XS)) -> head(activate(XS)) take(0,XS) -> nil take(s(N),cons(X,XS)) -> cons(X,n__take(N,activate(XS))) sel(0,cons(X,XS)) -> X sel(s(N),cons(X,XS)) -> sel(N,activate(XS)) from(X) -> n__from(X) take(X1,X2) -> n__take(X1,X2) activate(n__from(X)) -> from(X) activate(n__take(X1,X2)) -> take(X1,X2) activate(X) -> X )