Question: when did the ipad pro second generation come out
[{'answer': 'June 5 , 2017', 'provenance': [{'wikipedia_id': '47768148', 'title': 'IPad Pro', 'start_paragraph_id': 11, 'start_character': 51, 'end_paragraph_id': 11, 'end_character': 73, 'bleu_score': 1.0, 'section': 'Section::::Second generation.\n'}]}, {'provenance': [{'wikipedia_id': '47768148', 'title': 'IPad Pro', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 367, 'bleu_score': 0.5819042670135061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 931097123694150328}, 'section': 'Section::::Abstract.'}]}]