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Both these groups , while nominally fighting for the independence of Shan from Burma , were also functioning as private armies of two warlords ( Khun Sa , respectively Moh Heng ) , both heavily involved in the drug trade .
 Burma, Khun Sa
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Burma, Khun Sa