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He won a number of grants from the Government of Poland which enabled him to study music composition with Zbigniew Drzewiecki in Warsaw in 1959 and 1961 .
 Zbigniew Drzewiecki, Warsaw
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Zbigniew Drzewiecki, Warsaw