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The Armstrong Whitworth Sissit , also known as the Armstrong Whitworth F.K. 1 , was a prototype single-engined biplane fighter aircraft of the First World War .
 Armstrong Whitworth, Armstrong Whitworth
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Armstrong Whitworth, Armstrong Whitworth