Question: how many times has juventus won uefa champions league
[{'answer': 'twice', 'provenance': [{'wikipedia_id': '24595706', 'title': 'Juventus F.C. in European football', 'start_paragraph_id': 2, 'start_character': 340, 'end_paragraph_id': 2, 'end_character': 345, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '24595706', 'title': 'Juventus F.C. in European football', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1058, 'bleu_score': 0.957160251324892, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13622848431891766160}, 'section': 'Section::::Abstract.'}]}]