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Bergen National Opera ( BNO ) in Bergen , Norway , is a foundation established in 2005 by Bergen Philharmonic Orchestra , Den Nationale Scene , Grieg Hall and Bergen International Festival .
 Bergen, Opera, Bergen, Bergen, Bergen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bergen, Opera, Bergen, Bergen, Bergen