if n1 = n2 && n1 = n3 then Array.init n1 (fun i -> f a.(i) b.(i) c.(i))
else raise (Invalid_argument "Array.map3 size not matched.");;
-let decorate = fun s -> " Faustine -> " ^ s;;
+let decorate = fun s -> " Faustine -> " ^ s ^ "\n";;
let xor : bool -> bool -> bool =
fun a -> fun b -> (a || b) && (not (a && b));;