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In 1992 , he was a visiting scholar at the University of California , Berkeley , working under Nelson Polsby at the Institute of Governmental Studies .
 University of California , Berkeley, Nelson Polsby
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 University of California , Berkeley, Nelson Polsby