def sort(self):
        self._matches.sort_values(
            by=[constants.SIZE_FIELDNAME, constants.NGRAM_FIELDNAME,
                constants.COUNT_FIELDNAME, constants.LABEL_FIELDNAME,
                constants.WORK_FIELDNAME, constants.SIGLUM_FIELDNAME],
            ascending=[False, True, False, True, True, True], inplace=True)