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He also studied paintings by other artists whose style impressed him : Courbet , Charles-François Daubigny , Jean-François Millet , and Corot .
 Courbet, Charles-François Daubigny, Jean-François Millet, Corot
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Courbet, Charles-François Daubigny, Jean-François Millet, Corot