Question: when was the flamingo in las vegas built
[{'answer': '1946', 'provenance': [{'wikipedia_id': '1901121', 'title': 'Flamingo Las Vegas', 'start_paragraph_id': 2, 'start_character': 557, 'end_paragraph_id': 2, 'end_character': 561, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1901121', 'title': 'Flamingo Las Vegas', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 609, 'bleu_score': 0.8637039164744791, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2148339608895296273}, 'section': 'Section::::Abstract.'}]}]