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Although it is often served as a dessert , in many mountainous areas in Vietnam , like the indigenous hill tribe peoples of the Central Highlands and Hoàng Liên Sơn mountains in northern Vietnam , people eat xôi as a main dish .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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