(VAR x y z xs f) (RULES app(app(., 1), x) -> x app(app(., x), 1) -> x app(app(., app(i, x)), x) -> 1 app(app(., x), app(i, x)) -> 1 app(app(., app(i, y)), app(app(., y), z)) -> z app(app(., y), app(app(., app(i, y)), z)) -> z app(app(., app(app(., x), y)), z) -> app(app(., x), app(app(., y), z)) app(i, 1) -> 1 app(i, app(i, x)) -> x app(i, app(app(., x), y)) -> app(app(., app(i, y)), app(i, x)) app(app(map,f),nil) -> nil app(app(map,f),app(app(cons,x),xs)) -> app(app(cons,app(f,x)),app(app(map,f),xs)) app(app(filter,f),nil) -> nil app(app(filter,f),app(app(cons,x),xs)) -> app(app(app(app(filter2,app(f, x)),f),x),xs) app(app(app(app(filter2,true),f),x),xs) -> app(app(cons,x),app(app(filter,f),xs)) app(app(app(app(filter2,false),f),x),xs) -> app(app(filter,f),xs) )