def identifier(self, mask: str = '##-##/##') -> str:
        """Generate a random identifier by mask.

        With this method you can generate any identifiers that
        you need. Simply select the mask that you need.

        :param mask:
            The mask. Here ``@`` is a placeholder for characters and ``#`` is
            placeholder for digits.
        :return: An identifier.

        :Example:
            07-97/04
        """
        return self.random.custom_code(mask=mask)