@abc.abstractmethod<EOL><INDENT>def get_gradebook_columns_by_genus_type(self, gradebook_column_genus_type):<DEDENT>
return<EOL>
Gets a ``GradebookColumnList`` corresponding to the given gradebook column genus ``Type`` which does not include gradebook columns of genus types derived from the specified ``Type``.

        In plenary mode, the returned list contains all known gradebook
        columns or an error results. Otherwise, the returned list may
        contain only those gradebook columns that are accessible through
        this session.

        :param gradebook_column_genus_type: a gradebook column genus type
        :type gradebook_column_genus_type: ``osid.type.Type``
        :return: the returned ``GradebookColumn`` list
        :rtype: ``osid.grading.GradebookColumnList``
        :raise: ``NullArgument`` -- ``gradebook_column_genus_type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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