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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 _verify(self, rj, token):
 """ Verify a signed JSON Web Token :param rj: A :py:class:`cryptojwt.jws.JWS` instance :param token: The signed JSON Web Token :return: A verified message """

        keys = self.key_jar.get_jwt_verify_keys(rj.jwt)
        return rj.verify_compact(token, keys)