Question: which two schools have combined to win the last 5 women's college world series in softball
[{'answer': 'Oklahoma', 'provenance': [{'wikipedia_id': '547178', 'title': "Women's College World Series", 'start_paragraph_id': 1, 'start_character': 397, 'end_paragraph_id': 1, 'end_character': 405, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Florida'}]