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Oleg A. Korolev ( born March 2 , 1968 ) is Russian artist whose paintings have been exhibited and represented in the private and corporate art collections of Russia , Europe , North America , and Australia .
 Oleg, Korolev
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Oleg, Korolev