Question: when was the cathedral of santa maria del fiore built
[{'answer': 'begun in 1296', 'provenance': [{'wikipedia_id': '220884', 'title': 'Florence Cathedral', 'start_paragraph_id': 1, 'start_character': 136, 'end_paragraph_id': 1, 'end_character': 149, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'completed by 1436', 'provenance': [{'wikipedia_id': '220884', 'title': 'Florence Cathedral', 'start_paragraph_id': 1, 'start_character': 224, 'end_paragraph_id': 1, 'end_character': 241, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '220884', 'title': 'Florence Cathedral', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 490, 'bleu_score': 0.748133910414976, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15540039948474037739}, 'section': 'Section::::Abstract.'}]}]