Question: when did the dallas cowboys win their first super bowl
[{'answer': '1971', 'provenance': [{'wikipedia_id': '9974238', 'title': 'History of the Dallas Cowboys', 'start_paragraph_id': 21, 'start_character': 155, 'end_paragraph_id': 21, 'end_character': 159, 'bleu_score': 1.0, 'section': 'Section::::1960s.:1965–1969: First tastes of success.\n'}]}, {'provenance': [{'wikipedia_id': '9974238', 'title': 'History of the Dallas Cowboys', 'start_paragraph_id': 28, 'start_character': 0, 'end_paragraph_id': 28, 'end_character': 931, 'bleu_score': 0.8378751092306781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 779103406875086084}, 'section': 'Section::::1970s.:1971: First Super Bowl victory and the move to Texas Stadium.\n'}]}]