(VAR fun x xs y )
(STRATEGY INNERMOST)
(RULES 
        app(app(plus, x), 0) -> x
        app(app(plus, x), app(s, y)) -> app(s, app(app(plus, x), y))
        app(app(app(f, 0), app(s, 0)), x) -> app(app(app(f, x), app(app(plus, x), x)), x)
        app(app(g, x), y) -> x
        app(app(g, x), y) -> y
        app(app(map, fun), nil) -> nil
        app(app(map, fun), app(app(cons, x), xs)) -> app(app(cons, app(fun, x)), app(app(map, fun), xs))
        app(app(filter, fun), nil) -> nil
        app(app(filter, fun), app(app(cons, x), xs)) -> app(app(app(app(filter2, app(fun, x)), fun), x), xs)
        app(app(app(app(filter2, true), fun), x), xs) -> app(app(cons, x), app(app(filter, fun), xs))
        app(app(app(app(filter2, false), fun), x), xs) -> app(app(filter, fun), xs)
        
)