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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 _is_intersect_results(results):
 """Returns False if `results` has an n-gram that exists in only one label, True otherwise. :param results: results to analyze :type results: `pandas.DataFrame` :rtype: `bool` """

        sample = results.iloc[0]
        ngram = sample[constants.NGRAM_FIELDNAME]
        label = sample[constants.LABEL_FIELDNAME]
        return not(results[
            (results[constants.NGRAM_FIELDNAME] == ngram) &
            (results[constants.LABEL_FIELDNAME] != label)].empty)