Question: what does cdr stand for in the navy
[{'answer': 'commander', 'provenance': [{'wikipedia_id': '14157109', 'title': 'Commander (United States)', 'start_paragraph_id': 1, 'start_character': 22, 'end_paragraph_id': 1, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14157109', 'title': 'Commander (United States)', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 830, 'bleu_score': 0.6042992088804451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1215267082087826130}, 'section': 'Section::::Commander as a rank.:Naval.\n'}]}]