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Dmytro Yuriyovych Vereitynov ( ; born January 10 , 1983 in Kharkiv ) is a retired Ukrainian swimmer , who specialized in freestyle events .
 Kharkiv
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kharkiv