Question: what rank is a staff sergeant in the marines
[{'answer': 'E-6', 'provenance': [{'wikipedia_id': '288434', 'title': 'Staff sergeant', 'start_paragraph_id': 33, 'start_character': 24, 'end_paragraph_id': 33, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::National variations.:United States.:U.S. Army.\n'}]}, {'provenance': [{'wikipedia_id': '288434', 'title': 'Staff sergeant', 'start_paragraph_id': 33, 'start_character': 0, 'end_paragraph_id': 33, 'end_character': 731, 'bleu_score': 0.924932142113814, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3883658872783663141}, 'section': 'Section::::National variations.:United States.:U.S. Army.\n'}]}]