Question: how many times cowboys been to super bowl
[{'answer': 'eight', 'provenance': [{'wikipedia_id': '8121', 'title': 'Dallas Cowboys', 'start_paragraph_id': 1, 'start_character': 750, 'end_paragraph_id': 1, 'end_character': 755, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8121', 'title': 'Dallas Cowboys', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1365, 'bleu_score': 0.867886059116572, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13925118022403636503}, 'section': 'Section::::Abstract.'}]}]