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Balalaika virtuosi such as Boris Feoktistov and Pavel Necheporenko became stars both inside and outside the Soviet Union .
 Boris Feoktistov, Pavel Necheporenko, Soviet Union
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Boris Feoktistov, Pavel Necheporenko, Soviet Union