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He participated in the same heat as Sydney against two other swimmers Jorge Oliver of Puerto Rico and Yevgeniy Ryzhkov of Kazakhstan .
 Sydney, Yevgeniy Ryzhkov
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sydney, Yevgeniy Ryzhkov