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After spending a short time at the University of Berlin , he worked with Friedrich Wöhler at the University of Göttingen .
 University of Berlin, Friedrich Wöhler, University of Göttingen
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 Berlin, Friedrich Wöhler, University of Göttingen