Question: when was state of emergency declared in kenya
[{'answer': '20 October 1952', 'provenance': [{'wikipedia_id': '163054', 'title': 'Mau Mau Uprising', 'start_paragraph_id': 50, 'start_character': 3, 'end_paragraph_id': 50, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::British reaction.:State of emergency declared (October 1952).\n'}]}, {'provenance': [{'wikipedia_id': '163054', 'title': 'Mau Mau Uprising', 'start_paragraph_id': 50, 'start_character': 0, 'end_paragraph_id': 50, 'end_character': 571, 'bleu_score': 0.979054689945215, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2535097613319263990}, 'section': 'Section::::British reaction.:State of emergency declared (October 1952).\n'}]}]