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Mashtots Avenue ( ) , known as Lenin Avenue between 1924 and 1990 , is an avenue in the central Kentron district of Yerevan , Armenia .
 Kentron district, Yerevan, Armenia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kentron district, Yerevan, Armenia