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From 1921 to 1927 he was a student at Vkhutemas , where he wrote satirical poems and comic plays , including collaborations with Viktor Ardov , Ilya Ilf , Yevgeny Petrov , Valentin Kataev , Vladimir Mass , and Nikolai Erdman .
 Vkhutemas, Ilya Ilf, Yevgeny Petrov, Valentin Kataev, Vladimir, Nikolai Erdman
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vkhutemas, Ilya Ilf, Yevgeny Petrov, Valentin Kataev, Vladimir, Nikolai Erdman