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Three years after graduating from law school in 1967 with the first law state examination , Papier completed his Ph.D. studies at the Freie Universität Berlin .
 Papier, Freie Universität 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:
 Papier, Freie Universität Berlin