(VAR y x f xs) (RULES app(app(le, 0), y) -> true app(app(le, app(s, x)), 0) -> false app(app(le, app(s, x)), app(s, y)) -> app(app(le, x), y) app(pred, app(s, x)) -> x app(app(minus, x), 0) -> x app(app(minus, x), app(s, y)) -> app(pred, app(app(minus, x), y)) app(app(gcd, 0), y) -> y app(app(gcd, app(s, x)), 0) -> app(s, x) app(app(gcd, app(s, x)), app(s, y)) -> app(app(app(if_gcd, app(app(le, y), x)), app(s, x)), app(s, y)) app(app(app(if_gcd, true), app(s, x)), app(s, y)) -> app(app(gcd, app(app(minus, x), y)), app(s, y)) app(app(app(if_gcd, false), app(s, x)), app(s, y)) -> app(app(gcd, app(app(minus, y), x)), app(s, 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) )