code: def remove_permission(self, security_namespace_id, descriptor, permissions=None, token=None):
          
          route_values = {}
          if security_namespace_id is not None:
              route_values['securityNamespaceId'] = self._serialize.url('security_namespace_id', security_namespace_id, 'str')
          if permissions is not None:
              route_values['permissions'] = self._serialize.url('permissions', permissions, 'int')
          query_parameters = {}
          if descriptor is not None:
              query_parameters['descriptor'] = self._serialize.query('descriptor', descriptor, 'str')
          if token is not None:
              query_parameters['token'] = self._serialize.query('token', token, 'str')
          response = self._send(http_method='DELETE',
                                location_id='dd3b8bd6-c7fc-4cbd-929a-933d9c011c9d',
                                version='5.0',
                                route_values=route_values,
                                query_parameters=query_parameters)
          return self._deserialize('AccessControlEntry', response)
docs: RemovePermission.
          Removes the specified permissions on a security token for a user or group.
          :param str security_namespace_id: Security namespace identifier.
          :param str descriptor: Identity descriptor of the user to remove permissions for.
          :param int permissions: Permissions to remove.
          :param str token: Security token to remove permissions for.
          :rtype: :class:`<AccessControlEntry> <azure.devops.v5_0.security.models.AccessControlEntry>`