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Bahrenfeld railway station is on the Altona-Blankenese line and serviced by the city trains , located in Hamburg , Germany in the quarter Bahrenfeld of the Altona borough .
 Hamburg, Germany, Altona
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hamburg, Germany, Altona