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The Pew Research Center is an American think tank organization based in Washington , D.C. that provides information on issues , attitudes and trends shaping the United States and the world .
 Pew Research, Washington , D.C., United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pew Research, Washington , D.C., United States