Question: when did the three pence go out of circulation
[{'answer': '31 August 1971', 'provenance': [{'wikipedia_id': '221261', 'title': 'Threepence (British coin)', 'start_paragraph_id': 40, 'start_character': 79, 'end_paragraph_id': 40, 'end_character': 93, 'bleu_score': 1.0, 'section': 'Section::::Elizabeth II threepences.\n'}]}, {'provenance': [{'wikipedia_id': '221261', 'title': 'Threepence (British coin)', 'start_paragraph_id': 40, 'start_character': 0, 'end_paragraph_id': 40, 'end_character': 93, 'bleu_score': 0.861173529963367, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7213852670308260247}, 'section': 'Section::::Elizabeth II threepences.\n'}]}]