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These theories were tested in theatre , particularly with the work of Vsevolod Meyerhold , who had established what he called ' October in the theatre ' .
 Vsevolod Meyerhold
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vsevolod Meyerhold