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This led to the only two biplanes Messerschmitt ever designed , the second of which was the BFW M. 22 medium bomber , otherwise known as the Messerschmitt M 22 .
 Messerschmitt, Messerschmitt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Messerschmitt, Messerschmitt