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Ulf Thorbjörn Dageby ( born 10 May 1944 in Gothenburg ) is a Swedish rock musician , singer and songwriter .
 Ulf, Dageby, Gothenburg, Swedish
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ulf, Dageby, Gothenburg, Swedish