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He was a Brookings Institution senior fellow from 2007 to 2009 , and was a director of the Hamilton Project at Brookings .
 Brookings Institution, Hamilton Project, Brookings
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Brookings Institution, Hamilton Project, Brookings