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The Higher Institute of National Defence was an organ of the Coalition Government of Democratic Kampuchea , then of the Khmer Rouge remnants in 1990s , with an advisory role on military issues .
 Higher, Defence, Democratic Kampuchea
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Higher, Defence, Democratic Kampuchea