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The R1155 was a British aircraft communications receiver , which along with its associated T1154 transmitter , was used extensively by the Royal Air Force during World War II .
 organization: Royal Air Force
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 Air Force 
Answer:
 organization: Royal Air Force