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they ' re calling it a one of a kind exhibit t rarest and most precious diamonds in the world on display starting tomorrow morning at a smithsonian in washington .
 washington, they, a smithsonian in washington, the world
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 washington, they, a smithsonian in washington, the world