Question: which president appointed four justices to the supreme court
[{'answer': 'Richard Nixon', 'provenance': [{'wikipedia_id': '21201849', 'title': 'List of federal judges appointed by Richard Nixon', 'start_paragraph_id': 0, 'start_character': 36, 'end_paragraph_id': 0, 'end_character': 49, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21201849', 'title': 'List of federal judges appointed by Richard Nixon', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 610, 'bleu_score': 0.9808590314834971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14938970835783103538}, 'section': 'Section::::Abstract.'}]}]