Question: when did the buffalo sabres enter the nhl
[{'answer': '1970', 'provenance': [{'wikipedia_id': '69918', 'title': 'Buffalo Sabres', 'start_paragraph_id': 1, 'start_character': 215, 'end_paragraph_id': 1, 'end_character': 219, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '69918', 'title': 'Buffalo Sabres', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 525, 'bleu_score': 0.977897140678983, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17619120413692153890}, 'section': 'Section::::Abstract.'}]}]