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The Chittagong Hill Tracts region experienced unrest and an insurgency from 1975 to 1997 in an autonomy movement by its indigenous people .
 Chittagong Hill Tracts
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chittagong Hill Tracts