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Nikke Ström ( born 8 June 1951 ) is a Swedish rock musician , mostly known as the bass player in Nationalteatern .
 person: Nikke Ström
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Nikke Ström 
Answer:
 person: Nikke Ström