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Her portraits of Nathan Milstein and Alastair Cooke are in the collection of the National Portrait Gallery in Washington , DC .
 Nathan Milstein, Alastair Cooke, National Portrait Gallery, Washington , DC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nathan Milstein, Alastair Cooke, National Portrait Gallery, Washington , DC