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He then worked at the Department of Theoretical Physics at the University of Geneva , Geneva , Switzerland , until 1966 , and became full professor at the Department of Physics , University of Denver , Denver , Colorado .
 Geneva, Geneva, Switzerland, University of Denver, Denver
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Geneva, Geneva, Switzerland, University of Denver, Denver