Question: how many 7 11 locations are there in the us
[{'answer': '8,144', 'provenance': [{'wikipedia_id': '47420', 'title': '7-Eleven', 'start_paragraph_id': 79, 'start_character': 277, 'end_paragraph_id': 79, 'end_character': 282, 'bleu_score': 1.0, 'section': 'Section::::Global operations.:North America.:United States.\n'}]}, {'provenance': [{'wikipedia_id': '47420', 'title': '7-Eleven', 'start_paragraph_id': 79, 'start_character': 0, 'end_paragraph_id': 79, 'end_character': 578, 'bleu_score': 0.765505442915366, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7383079753980858895}, 'section': 'Section::::Global operations.:North America.:United States.\n'}]}]