Question: how many parts are in the waco series
[{'answer': 'six', 'provenance': [{'wikipedia_id': '54059998', 'title': 'Waco (miniseries)', 'start_paragraph_id': 1, 'start_character': 153, 'end_paragraph_id': 1, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]