Question: where is the darts being held in las vegas
[{'answer': 'Mandalay Bay', 'provenance': [{'wikipedia_id': '56776276', 'title': '2018 US Darts Masters', 'start_paragraph_id': 1, 'start_character': 294, 'end_paragraph_id': 1, 'end_character': 306, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '56776276', 'title': '2018 US Darts Masters', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 336, 'bleu_score': 0.9113578042875031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7383989608002735778}, 'section': 'Section::::Abstract.'}]}]