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Bremen Switzerland ( ) is an undulating geest landscape in the north of Bremen ( Bremen Nord ) and the adjacent district of Osterholz district , and forms the western portion of the Osterholz Geest .
 Osterholz district, Osterholz
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Osterholz district, Osterholz