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Meaning – text theory ( MTT ) is a theoretical linguistic framework , first put forward in Moscow by Aleksandr Žolkovskij and Igor Mel ’ čuk , for the construction of models of natural language .
 Igor Mel ’ čuk
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Igor Mel ’ čuk