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Barter has always been a feature of the Soviet Union 's foreign trade , but Yeltsin 's decrees liberalising foreign trade in 1991-1992 has given barter a new impetus .
 Yeltsin, Soviet Union
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Yeltsin, Soviet Union