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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def xiphias_get_users_by_alias(self, alias_jids: Union[str, List[str]]):
 """ Like xiphias_get_users, but for aliases instead of jids. :param alias_jids: one jid, or a list of jids """

        return self._send_xmpp_element(xiphias.UsersByAliasRequest(alias_jids))