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He is Oberbürgermeister of Heidenheim since February 1 , 2000 , re-elected on November 11 , 2007 .
 Heidenheim
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Heidenheim