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The largest rivers in the Harz are the Innerste , the Oker and the Bode in the north ; the Wipper in the east ; and the Oder in the south .
 Harz, Innerste, Oker, Bode, Wipper, Oder
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Harz, Innerste, Oker, Bode, Wipper, Oder