Question: when did ras al khaima join the emirates
[{'answer': '10 February 1972', 'provenance': [{'wikipedia_id': '434928', 'title': 'Ras Al Khaimah', 'start_paragraph_id': 24, 'start_character': 3, 'end_paragraph_id': 24, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::History.:Pirate coast.:1820 treaty.\n'}]}, {'provenance': [{'wikipedia_id': '434928', 'title': 'Ras Al Khaimah', 'start_paragraph_id': 24, 'start_character': 0, 'end_paragraph_id': 24, 'end_character': 128, 'bleu_score': 0.910879922930628, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8755658922098112531}, 'section': 'Section::::History.:Pirate coast.:1820 treaty.\n'}]}]