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Rolf Billberg ( 22 August 1930 – 17 August 1966 ) was a Swedish alto saxophone player active during the 1950s and 1960s .
 Rolf Billberg, 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:
 Rolf Billberg, Swedish