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Between 1687 and 1704 Kochubey was a close associate of the Ukrainian hetman Ivan Mazepa .
 Kochubey, Ivan Mazepa
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kochubey, Ivan Mazepa