Question: how many years were arsenal in the champions league
[{'answer': 'nineteen', 'provenance': [{'wikipedia_id': '35953805', 'title': 'Arsenal F.C. in European football', 'start_paragraph_id': 2, 'start_character': 512, 'end_paragraph_id': 2, 'end_character': 520, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '35953805', 'title': 'Arsenal F.C. in European football', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 637, 'bleu_score': 0.88904449755421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4144133597328201350}, 'section': 'Section::::Abstract.'}]}]