eland/dataframe.py [2115:2125]:
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        filter_options_passed = sum([items is not None, bool(like), bool(regex)])
        if filter_options_passed > 1:
            raise TypeError(
                "Keyword arguments `items`, `like`, or `regex` "
                "are mutually exclusive"
            )
        elif filter_options_passed == 0:
            raise TypeError("Must pass either 'items', 'like', or 'regex'")

        # axis defaults to 'columns' for DataFrame, 'index' for Series
        if axis is None:
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eland/series.py [689:699]:
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        filter_options_passed = sum([items is not None, bool(like), bool(regex)])
        if filter_options_passed > 1:
            raise TypeError(
                "Keyword arguments `items`, `like`, or `regex` "
                "are mutually exclusive"
            )
        elif filter_options_passed == 0:
            raise TypeError("Must pass either 'items', 'like', or 'regex'")

        # axis defaults to 'columns' for DataFrame, 'index' for Series
        if axis is None:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -