Question: when did the emperor of japan lose power
[{'answer': 'the 1947 Constitution', 'provenance': [{'wikipedia_id': '10110', 'title': 'Emperor of Japan', 'start_paragraph_id': 3, 'start_character': 777, 'end_paragraph_id': 3, 'end_character': 798, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '10110', 'title': 'Emperor of Japan', 'start_paragraph_id': 3, 'start_character': 4, 'end_paragraph_id': 3, 'end_character': 840, 'bleu_score': 0.8009685047953161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1075545646277686490}, 'section': 'Section::::Abstract.'}]}]