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After the construction of Thoai Ha Canal , Emperor Gia Long of Nguyễn Dynasty ordered the mandarin Nguyen Van Thoai to dig a new canal along the Cambodia n – Vietnamese border .
 Gia Long, Cambodia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gia Long, Cambodia