Question: how many times have arsenal won the double
[{'answer': 'three', 'provenance': [{'wikipedia_id': '2174', 'title': 'Arsenal F.C.', 'start_paragraph_id': 7, 'start_character': 209, 'end_paragraph_id': 7, 'end_character': 214, 'bleu_score': 1.0, 'section': 'Section::::History.:1886–1919: Changing names.\n'}]}]