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On 11 July 1940 , he shot down a Messerschmitt Bf 110 , and he added two more Bf 110s on 11 August 1940 and three more Bf 110s on the 13th .
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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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