Question: how many planes did japan lose at pearl harbor
[{'answer': '29', 'provenance': [{'wikipedia_id': '60098', 'title': 'Attack on Pearl Harbor', 'start_paragraph_id': 3, 'start_character': 875, 'end_paragraph_id': 3, 'end_character': 877, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '60098', 'title': 'Attack on Pearl Harbor', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 995, 'bleu_score': 0.866729555826636, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12823906810841672196}, 'section': 'Section::::Abstract.'}]}]