Question: who has won the wsop main event twice
[{'answer': 'Johnny Moss', 'provenance': [{'wikipedia_id': '21086145', 'title': 'List of World Series of Poker Main Event champions', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Milestones.\n'}]}, {'answer': 'Stu Ungar', 'provenance': [{'wikipedia_id': '21086145', 'title': 'List of World Series of Poker Main Event champions', 'start_paragraph_id': 4, 'start_character': 75, 'end_paragraph_id': 4, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Milestones.\n'}]}, {'answer': 'Doyle Brunson', 'provenance': [{'wikipedia_id': '21086145', 'title': 'List of World Series of Poker Main Event champions', 'start_paragraph_id': 4, 'start_character': 207, 'end_paragraph_id': 4, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::Milestones.\n'}]}, {'answer': 'Johnny Chan', 'provenance': [{'wikipedia_id': '21086145', 'title': 'List of World Series of Poker Main Event champions', 'start_paragraph_id': 4, 'start_character': 225, 'end_paragraph_id': 4, 'end_character': 236, 'bleu_score': 1.0, 'section': 'Section::::Milestones.\n'}]}, {'provenance': [{'wikipedia_id': '21086145', 'title': 'List of World Series of Poker Main Event champions', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 588, 'bleu_score': 0.9526401996952971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10056875923153493669}, 'section': 'Section::::Milestones.\n'}]}]