(VAR L X X1 X2 XS Y YS )
(RULES 
        app(nil, YS) -> YS
        app(cons(X, XS), YS) -> cons(X, n__app(activate(XS), YS))
        from(X) -> cons(X, n__from(s(X)))
        zWadr(nil, YS) -> nil
        zWadr(XS, nil) -> nil
        zWadr(cons(X, XS), cons(Y, YS)) -> cons(app(Y, cons(X, n__nil)), n__zWadr(activate(XS), activate(YS)))
        prefix(L) -> cons(nil, n__zWadr(L, prefix(L)))
        app(X1, X2) -> n__app(X1, X2)
        from(X) -> n__from(X)
        nil -> n__nil
        zWadr(X1, X2) -> n__zWadr(X1, X2)
        activate(n__app(X1, X2)) -> app(X1, X2)
        activate(n__from(X)) -> from(X)
        activate(n__nil) -> nil
        activate(n__zWadr(X1, X2)) -> zWadr(X1, X2)
        activate(X) -> X
        
)