Which of the following authors won the Booker Prize twice?

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Q: 114 (IAS/2004)
Which of the following authors won the Booker Prize twice?

question_subject: 

General Knowledge

question_exam: 

IAS

stats: 

0,10,10,4,10,5,1

keywords: 

{'booker prize': [0, 0, 1, 1], 'margaret atwood': [0, 0, 1, 0], 'authors': [0, 1, 4, 1], 'graham swift': [0, 0, 1, 0], 'ian mcewan': [0, 0, 1, 0]}