Question: how many games are in a series in hockey
[{'answer': 'seven', 'provenance': [{'wikipedia_id': '3681863', 'title': 'Season structure of the NHL', 'start_paragraph_id': 9, 'start_character': 145, 'end_paragraph_id': 9, 'end_character': 150, 'bleu_score': 1.0, 'section': 'Section::::Stanley Cup playoffs.\n'}]}, {'provenance': [{'wikipedia_id': '3681863', 'title': 'Season structure of the NHL', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 1087, 'bleu_score': 0.9891004105789801, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18308854211212473168}, 'section': 'Section::::Stanley Cup playoffs.\n'}]}]