Question: when was the flamingo hotel in las vegas built
[{'answer': 'December 26 , 1946', 'provenance': [{'wikipedia_id': '1901121', 'title': 'Flamingo Las Vegas', 'start_paragraph_id': 44, 'start_character': 341, 'end_paragraph_id': 44, 'end_character': 359, 'bleu_score': 1.0, 'section': 'Section::::In popular culture.:Film.\n'}]}]