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From 1920 to 1921 he worked at the Russian Telegraph Agency as a writer and designer of satirical propaganda posters ( so-called Rosta Windows ) , under the direction of Vladimir Mayakovsky .
 Russian Telegraph Agency, Vladimir Mayakovsky
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Russian Telegraph Agency, Vladimir Mayakovsky