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He began his victory roll on 26 May 1918 ; by 10 November , the day before the armistice , he had accounted for two observation balloons and sixteen enemy planes destroyed , and two planes driven down out of control .
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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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