20533
The Vickers response , the F.B. 11 , designed by R.L. Howard-Flanders , was a large , single-bay , biplane of tractor layout .
 Vickers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vickers