Question: is the first round of nhl playoffs best of 5 or best of 7
[{'answer': 'best - of - seven', 'provenance': [{'wikipedia_id': '10490910', 'title': 'Stanley Cup playoffs', 'start_paragraph_id': 63, 'start_character': 845, 'end_paragraph_id': 63, 'end_character': 868, 'bleu_score': 1.0, 'section': 'Section::::NHL Playoff Results.:1927–1942.\n'}]}, {'provenance': [{'wikipedia_id': '10490910', 'title': 'Stanley Cup playoffs', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 306, 'bleu_score': 0.8540011747552251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12933043224356003555}, 'section': 'Section::::Current format.\n'}]}]