@abc.abstractmethod<EOL><INDENT>def unassign_agent_from_agency(self, agent_id, agency_id):<DEDENT>
pass<EOL>
Removes an ``Agent`` from an ``Agency``.

        :param agent_id: the ``Id`` of the ``Agent``
        :type agent_id: ``osid.id.Id``
        :param agency_id: the ``Id`` of the ``Agency``
        :type agency_id: ``osid.id.Id``
        :raise: ``NotFound`` -- ``agent_id`` or ``agency_id`` not found or ``agent_id`` not assigned to ``agency_id``
        :raise: ``NullArgument`` -- ``agent_id`` or ``agency_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*