protected static function performValidateStrict(array $ruts)
    {
        foreach ($ruts as $rut) {

            if (!preg_match('/(\d){1,2}.\d{3}.\d{3}\-[\dkK]/', $rut)) {
                return false;
            }

            if (!self::validateRut($rut)) {
                return false;
            };
        }
        return true;
    }