Question: how many books are in series of unfortunate events
[{'answer': 'thirteen', 'provenance': [{'wikipedia_id': '568208', 'title': 'A Series of Unfortunate Events', 'start_paragraph_id': 1, 'start_character': 46, 'end_paragraph_id': 1, 'end_character': 54, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '568208', 'title': 'A Series of Unfortunate Events', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1021, 'bleu_score': 0.881102174814786, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14238270685114862531}, 'section': 'Section::::Abstract.'}]}]