Question: when is season 4 of flash coming out
[{'answer': 'on October 10 , 2017', 'provenance': [{'wikipedia_id': '53527130', 'title': 'The Flash (season 4)', 'start_paragraph_id': 45, 'start_character': 24, 'end_paragraph_id': 45, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Release.:Broadcast.\n'}]}, {'answer': 'October 10 , 2017', 'provenance': [{'wikipedia_id': '53527130', 'title': 'The Flash (season 4)', 'start_paragraph_id': 45, 'start_character': 27, 'end_paragraph_id': 45, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Release.:Broadcast.\n'}]}, {'provenance': [{'wikipedia_id': '53527130', 'title': 'The Flash (season 4)', 'section': 'Section::::Release.:Broadcast.\n', 'start_paragraph_id': 45, 'end_paragraph_id': 45, 'meta': {'evidence_span': ['The season began airing on October 10, 2017,', 'The season began airing on October 10, 2017, on The CW in the United States, and on CTV in Canada.', 'The season began airing on October 10, 2017']}}]}]