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Life Heinrich Nissen studied in Kiel and Berlin under August Boeckh and Theodor Mommsen .
 Heinrich Nissen, Kiel, Berlin, August Boeckh, Theodor Mommsen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Heinrich Nissen, Kiel, Berlin, August Boeckh, Theodor Mommsen