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** Todor Zhivkov , Chairman of the Council of State of Bulgaria ( 1971–1989 )
 Todor Zhivkov, Chairman of the Council of State of Bulgaria
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Todor Zhivkov, Chairman of the Council of State of Bulgaria