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Robert McNamara suggests that the overthrow of Duong Van Minh by Nguyen Khanh , in January 1964 , reflected different U.S. and Vietnamese priorities . "
 Robert McNamara, Duong Van Minh, Nguyen Khanh
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert McNamara, Duong Van Minh, Nguyen Khanh