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Herwart Koppenhöfer ( born 25 May 1946 ) is a retired German football player .
 Herwart Koppenhöfer, German
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Herwart Koppenhöfer, German