Question: when did wells fargo buy first interstate bank
[{'answer': 'April 1 , 1996', 'provenance': [{'wikipedia_id': '8903842', 'title': 'First Interstate Bancorp', 'start_paragraph_id': 12, 'start_character': 812, 'end_paragraph_id': 12, 'end_character': 829, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '8903842', 'title': 'First Interstate Bancorp', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 869, 'bleu_score': 0.9676402440805071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16968468476843837086}, 'section': 'Section::::History.\n'}]}]