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Tatiana Viktorovna Kravtchenko ( Russian : Татьяна Викторовна Кравченко ; born 13 June 1936 ) is a retired Soviet rhythmic gymnast .
 Soviet
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Soviet