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Sergei Gennadiyevich Khorokhordin ( ) ( born October 9 , 1985 in Barnaul ) , is a Russia n gymnast .
 Sergei, Khorokhordin, Barnaul, Russia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sergei, Khorokhordin, Barnaul, Russia