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Political career Platzeck represented ARGUS , a Potsdam environmental organization he had co-founded with and at the initiative of Carola Stabe , at the founding of the Grüne Liga association of local environmental organizations in East Germany in 1989 .
 Platzeck, Potsdam, East Germany
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Platzeck, Potsdam, East Germany