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At least 60 such works had been offered for sale to the National Portrait Gallery in the 19th century within the first forty years of its existence ; the Ashbourne portrait was one of these .
 National Portrait Gallery, Ashbourne
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 National Portrait Gallery, Ashbourne