Question: who served as both president and vice president
[{'answer': 'John Tyler'}, {'answer': 'Millard Fillmore'}, {'answer': 'Andrew Johnson'}, {'answer': 'Chester A. Arthur'}, {'answer': 'Theodore Roosevelt'}, {'answer': 'Calvin Coolidge', 'provenance': [{'wikipedia_id': '710081', 'title': 'List of Presidents of the United States by other offices held', 'start_paragraph_id': 13, 'start_character': 105, 'end_paragraph_id': 13, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Federal government.:Executive branch.:Cabinet secretaries.\n'}]}, {'answer': 'Harry Truman'}, {'answer': 'Richard Nixon'}, {'answer': 'Lyndon B. Johnson'}, {'answer': 'Gerald Ford'}]