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He eventually moved to Cambodia with his family but had to escape the Khmer rouge and move to Udon Thani , Thailand in 1975 .
 Cambodia, Khmer rouge, Udon Thani, Thailand
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cambodia, Khmer rouge, Udon Thani, Thailand