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Thereafter , he served as a traveling review officer at Hunan Circuit ( 湖南 , headquartered in modern Changsha , Hunan ) .
 Hunan, Changsha, Hunan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hunan, Changsha, Hunan