Question: when did ios 11 beta 1 come out
[{'answer': 'June 26 , 2017', 'provenance': [{'wikipedia_id': '53862244', 'title': 'IOS 11', 'start_paragraph_id': 8, 'start_character': 217, 'end_paragraph_id': 8, 'end_character': 231, 'bleu_score': 1.0, 'section': 'Section::::History.:Introduction and initial release.\n'}]}, {'provenance': [{'wikipedia_id': '53862244', 'title': 'IOS 11', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 230, 'bleu_score': 0.9466178497997021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9347161619169878655}, 'section': 'Section::::History.:Introduction and initial release.\n'}]}]