Question: how many times has a nfl teams lost every game
[{'answer': 'twelve times', 'provenance': [{'wikipedia_id': '14417906', 'title': 'List of winless seasons', 'start_paragraph_id': 1, 'start_character': 161, 'end_paragraph_id': 1, 'end_character': 173, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14417906', 'title': 'List of winless seasons', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 534, 'bleu_score': 0.9483044717870771, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6492375858855031550}, 'section': 'Section::::Abstract.'}]}]