@abc.abstractmethod<EOL><INDENT>def get_grade_systems_by_gradebooks(self, gradebook_ids):<DEDENT>
return<EOL>
Gets the list of grade systems corresponding to a list of ``Gradebooks``.

        :param gradebook_ids: list of gradebook ``Ids``
        :type gradebook_ids: ``osid.id.IdList``
        :return: list of grade systems
        :rtype: ``osid.grading.GradeSystemList``
        :raise: ``NullArgument`` -- ``gradebook_ids`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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