public static function makeValid(...$ruts)
    {
        $ruts = self::make(...$ruts);

        $ruts = is_array($ruts) ? $ruts : [$ruts];

        foreach ($ruts as $rut) {
            if (!$rut->isValid()) {
                throw new InvalidRutException($rut);
            }
        }

        return count($ruts) === 1 ? $ruts[0] : $ruts;
    }