Question: how long did it take to build the 7 mile bridge in the keys
[{'answer': 'from 1978 to 1982', 'provenance': [{'wikipedia_id': '980422', 'title': 'Seven Mile Bridge', 'start_paragraph_id': 5, 'start_character': 40, 'end_paragraph_id': 5, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '980422', 'title': 'Seven Mile Bridge', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 57, 'bleu_score': 0.8070557274927981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6571486028234619302}, 'section': 'Section::::History.\n'}]}]