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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _rows_sort(self, rows):
 """ Returns a list of rows sorted by start and end date. :param list[dict[str,T]] rows: The list of rows. :rtype: list[dict[str,T]] """

        return sorted(rows, key=lambda row: (row[self._key_start_date], row[self._key_end_date]))