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After the foundation of the Nguyễn Dynasty , Duyệt served as a high-ranking mandarin and , later , viceroy of the southern part of Vietnam .
 Nguyễn, Vietnam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nguyễn, Vietnam