Question: who owned the first casino in las vegas
[{'answer': 'local Las Vegas business owners', 'provenance': [{'wikipedia_id': '2087269', 'title': 'History of Las Vegas', 'start_paragraph_id': 22, 'start_character': 518, 'end_paragraph_id': 22, 'end_character': 549, 'bleu_score': 1.0, 'section': 'Section::::1930–1941: Hoover Dam and the first casinos.\n'}]}, {'answer': 'Mafia crime lords', 'provenance': [{'wikipedia_id': '2087269', 'title': 'History of Las Vegas', 'start_paragraph_id': 22, 'start_character': 555, 'end_paragraph_id': 22, 'end_character': 572, 'bleu_score': 1.0, 'section': 'Section::::1930–1941: Hoover Dam and the first casinos.\n'}]}, {'provenance': [{'wikipedia_id': '2087269', 'title': 'History of Las Vegas', 'start_paragraph_id': 22, 'start_character': 0, 'end_paragraph_id': 22, 'end_character': 676, 'bleu_score': 0.982060959997838, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3693240146349208447}, 'section': 'Section::::1930–1941: Hoover Dam and the first casinos.\n'}]}]