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Opera singer Malena Ernman has criticized the Riksbank for choosing a design where Birgit Nilsson has been depicted performing " Die Walküre " by Richard Wagner .
 Malena Ernman, Riksbank, Birgit Nilsson, Richard Wagner
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Malena Ernman, Riksbank, Birgit Nilsson, Richard Wagner