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Bergdølmo began his senior career at Lillestrøm in 1991 , before transferring to Rosenborg for a fee of ahead of the 1997 season .
 Bergdølmo, Lillestrøm, Rosenborg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bergdølmo, Lillestrøm, Rosenborg