Question: what did the huns do to the roman empire
[{'answer': 'collapse', 'provenance': [{'wikipedia_id': '13519', 'title': 'Huns', 'start_paragraph_id': 4, 'start_character': 79, 'end_paragraph_id': 4, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]