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He studied art in the Penza and Kiev art schools from 1897 to 1905 , and then in the private studio of Dmitry Kardovsky in Saint Petersburg in 1906 .
 Penza, Kiev, Dmitry Kardovsky, Saint Petersburg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Penza, Kiev, Dmitry Kardovsky, Saint Petersburg