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In 1954 , Kortokraks joined the School of Vision , part of the international Summer Academy in Salzburg , as a teaching assistant to Oskar Kokoschka .
 Kortokraks, Salzburg, Oskar Kokoschka
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, Salzburg, Oskar Kokoschka