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The book said Khrushchev 's order to ignore the blockade was disclosed in a largely unknown work by dissident Soviet historian Roy Medvedev .
 Khrushchev, Soviet; Roy Medvedev, Soviet
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: Organization based in, Located in, Live in, Work for, Kill 
Text: {0} 
Answer:
 Khrushchev, Soviet; Roy Medvedev, Soviet