Question: who was the last nfl team to win back-to-back super bowls
[{'answer': 'New England Patriots', 'provenance': [{'wikipedia_id': '2145410', 'title': 'List of Super Bowl champions', 'start_paragraph_id': 3, 'start_character': 4, 'end_paragraph_id': 3, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2145410', 'title': 'List of Super Bowl champions', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 1830, 'bleu_score': 0.6855949751155821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10601153652921847818}, 'section': 'Section::::Abstract.'}]}]