@abc.abstractmethod<EOL><INDENT>def get_grade_system_search_order(self):<DEDENT>
return<EOL>
Gets a grade system search order.

        :return: a grade system search order
        :rtype: ``osid.grading.GradeSystemSearchOrder``
        :raise: ``Unimplemented`` -- ``supports_grade_system_search_order()`` is ``false``

        *compliance: optional -- This method must be implemented if
        ``supports_grade_system_search_order()`` is ``true``.*