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A single-engined biplane , only three E.S. 1s were built , although at least one was used by a home defence squadron of the Royal Flying Corps .
 organization: Royal Flying Corps
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Royal Flying Corps 
Answer:
 organization: Royal Flying Corps