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When German president Johannes Rau visited Nanjing University in 2003 , he expressed concern about the dilapidated condition of John Rabe ’s former residence .
 Johannes Rau, Nanjing University, Rabe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Johannes Rau, Nanjing University, Rabe