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He is a two-time Olympian ( 2000 and 2004 ) , a three-time swimmer at the Commonwealth Games ( 2002 , 2006 , 2010 ) , and a double gold medalist in the 50 and 100 m butterfly at the Asian Age Group Championships .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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