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Kronprisessan Victoria was used as a day ferry on the Gothenburg - Frederikshavn route until March 1982 when the vessel was converted to a night ferry for the Gothenburg - Kiel route .
 Gothenburg, Frederikshavn, Gothenburg, Kiel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gothenburg, Frederikshavn, Gothenburg, Kiel