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From October 1961 to June 1967 he studied physics at the University of Stuttgart and the Technical University of Berlin and the Free University of Berlin .
 University of Stuttgart, Technical University of Berlin, Free University of Berlin
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 Stuttgart, Technical University of Berlin, Free University of Berlin