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His son , Sergei Sedov , who died in 1937 , was rehabilitated in 1988 , as was Nikolai Bukharin .
 Sergei Sedov, Nikolai Bukharin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sergei Sedov, Nikolai Bukharin