Question: when did the romans start building the via apia
[{'answer': '312 BC', 'provenance': [{'wikipedia_id': '47569', 'title': 'Appian Way', 'start_paragraph_id': 2, 'start_character': 142, 'end_paragraph_id': 2, 'end_character': 148, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '47569', 'title': 'Appian Way', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 172, 'bleu_score': 0.9383861709333501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3420219864220144106}, 'section': 'Section::::Abstract.'}]}]