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Called " Songbun " , Barbara Demick describes this " class structure " as an updating of the hereditary " caste system " , a combination of Confucianism and Stalinism .
 Songbun, Barbara Demick
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Songbun, Barbara Demick