Question: when does how to get away with a murderer air season 4
[{'answer': 'September 28 , 2017', 'provenance': [{'wikipedia_id': '53496873', 'title': 'How to Get Away with Murder (season 4)', 'start_paragraph_id': 1, 'start_character': 153, 'end_paragraph_id': 1, 'end_character': 172, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '53496873', 'title': 'How to Get Away with Murder (season 4)', 'start_paragraph_id': 1, 'start_character': 21, 'end_paragraph_id': 1, 'end_character': 370, 'bleu_score': 0.8007586438016321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2047539440152708395}, 'section': 'Section::::Abstract.'}]}]