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Serving again as operations officer , he became an ace on November 24 , 1944 , when he downed three Kawasaki Ki-61 s ( " Tony " s ) and one Mitsubishi A6M Zero ( " Zeke " ) in one day .
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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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