Question: when was the last time dallas was in the superbowl
[{'answer': 'January 1996', 'provenance': [{'wikipedia_id': '8121', 'title': 'Dallas Cowboys', 'start_paragraph_id': 134, 'start_character': 598, 'end_paragraph_id': 134, 'end_character': 610, 'bleu_score': 1.0, 'section': 'Section::::Rivalries.:Pittsburgh Steelers.\n'}]}, {'provenance': [{'wikipedia_id': '8121', 'title': 'Dallas Cowboys', 'start_paragraph_id': 134, 'start_character': 0, 'end_paragraph_id': 134, 'end_character': 1187, 'bleu_score': 0.9466694650994311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12685891801663276224}, 'section': 'Section::::Rivalries.:Pittsburgh Steelers.\n'}]}]