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Budi Darma continued lecturing at the English Department of the State University of Surabaya until his retirement , at the age of 70 , in 2007 .
 Budi Darma, Surabaya
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Budi Darma, Surabaya