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In 1928-1932 he worked as a Belarusian language professor in the University of Warsaw and in 1927 – 1940 - in the University of Vilnius .
 Belarusian, University of Warsaw, University of Vilnius
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Belarusian, University of Warsaw, University of Vilnius