Question: when was the apple ipad air 2 released
[{'answer': 'October 22 , 2014', 'provenance': [{'wikipedia_id': '44129907', 'title': 'IPad Air 2', 'start_paragraph_id': 4, 'start_character': 211, 'end_paragraph_id': 4, 'end_character': 228, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '44129907', 'title': 'IPad Air 2', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 377, 'bleu_score': 0.9226596185977011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 203026943554051315}, 'section': 'Section::::Abstract.'}]}]