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From 1923 to 1924 Red ' ko , together with Nikritin , developed his theories of Electroorganism and Luminism .
 person: Nikritin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Nikritin