(VAR fun x xs y z )
(STRATEGY INNERMOST)
(RULES 
        app(app(app(f, app(app(g, x), y)), x), z) -> app(app(app(f, z), z), z)
        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)
        
)