Question: how many volumes of cowboy bebop are there
[{'answer': '2', 'provenance': [{'wikipedia_id': '7341', 'title': 'Cowboy Bebop', 'start_paragraph_id': 1, 'start_character': 66, 'end_paragraph_id': 1, 'end_character': 67, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]