(VAR N X XS )
(STRATEGY CONTEXTSENSITIVE
        (from 1) 
        (cons 1) 
        (s 1) 
        (after 1 2) 
        (0 ) 
)
(RULES 
        from(X) -> cons(X, from(s(X)))
        after(0, XS) -> XS
        after(s(N), cons(X, XS)) -> after(N, XS)
        
)