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Andreae replaced Ralf Dahrendorf , a West German sociologist and professor , who withdrew the pledge because he did not want to speak to an audience that included Kurt Waldheim , the President of Austria .
 Ralf Dahrendorf, Kurt Waldheim
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ralf Dahrendorf, Kurt Waldheim