Question: when does the flash cross over with arrow
[{'answer': 'November 27 , 2017', 'provenance': [{'wikipedia_id': '54799795', 'title': 'Crisis on Earth-X', 'start_paragraph_id': 40, 'start_character': 52, 'end_paragraph_id': 40, 'end_character': 70, 'bleu_score': 1.0, 'section': 'Section::::Release.:Broadcast.\n'}]}, {'provenance': [{'wikipedia_id': '54799795', 'title': 'Crisis on Earth-X', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 505, 'bleu_score': 0.874905272855484, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12023766427861524172}, 'section': 'Section::::Abstract.'}]}]