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The borough of Petershagen includes Westphalia 's northernmost Weser settlement , Schlüsselburg .
 Petershagen, Schlüsselburg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Petershagen, Schlüsselburg