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Vladimir Mikhailovich Vinogradov ( 1921 – 21 June 1997 ) was a prominent Soviet diplomat in the second half of the 20th century .
 Vladimir Mikhailovich Vinogradov, 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:
 Vladimir Mikhailovich Vinogradov, Soviet