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In 2009 , Bergsten made the following arguments for such a relationship : Zbigniew Brzezinski has been a vocal advocate for the concept .
 Bergsten, Zbigniew Brzezinski
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bergsten, Zbigniew Brzezinski