Question: where was season 7 episode 4 of game of thrones filmed
[{'answer': 'August 31 , 2016 ,', 'provenance': [{'wikipedia_id': '47398513', 'title': 'Game of Thrones (season 7)', 'start_paragraph_id': 61, 'start_character': 3, 'end_paragraph_id': 61, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Production.:Casting.\n'}]}, {'provenance': [{'wikipedia_id': '47398513', 'title': 'Game of Thrones (season 7)', 'start_paragraph_id': 57, 'start_character': 0, 'end_paragraph_id': 57, 'end_character': 591, 'bleu_score': 0.9812185674664711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16290385978032707917}, 'section': 'Section::::Production.:Filming.\n'}]}]