Question: when did the viking age start and end
[{'answer': '793 -- 1066 AD'}, {'provenance': [{'wikipedia_id': '32538', 'title': 'Viking Age', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 537, 'bleu_score': 0.872061969153156, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12029291643532241634}, 'section': 'Section::::Abstract.'}]}]