<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def diff_supplied(self, results_filenames, labels, tokenizer, output_fh):
 """Returns `output_fh` populated with CSV results giving the n-grams that are unique to the witnesses in each set of works in `results_sets`, using the labels in `labels`. Note that this is not the same as the symmetric difference of these sets, except in the case where there are only two labels. :param results_filenames: list of results filenames to be diffed :type results_filenames: `list` of `str` :param labels: labels to be applied to the results_sets :type labels: `list` :param tokenizer: tokenizer for the n-grams :type tokenizer: `Tokenizer` :param output_fh: object to output results to :type output_fh: file-like object :rtype: file-like object """

        self._add_temporary_results_sets(results_filenames, labels)
        query = constants.SELECT_DIFF_SUPPLIED_SQL
        self._logger.info('Running supplied diff query')
        self._logger.debug('Query: {}'.format(query))
        self._log_query_plan(query, [])
        cursor = self._conn.execute(query)
        return self._diff(cursor, tokenizer, output_fh)