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On November 19 , 1917 , Markov escaped from prison and together with generals Denikin and Kornilov , he raised the Volunteer Army in Don region .
 Markov, Denikin, Kornilov, Don region
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Markov, Denikin, Kornilov, Don region