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From 1956 until the collapse of the school in 1963 , Kortokraks was Kokoschka 's chief assistant at the School of Vision .
 Kortokraks, Kokoschka 's
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kortokraks, Kokoschka 's