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The Saro A. 33 was a British prototype flying boat built by Saunders-Roe Limited in response to a British Air Ministry Specification R. 2/33 and in competition with the Short Sunderland .
 British, Saunders-Roe Limited, Air Ministry
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 British, Saunders-Roe Limited, Air Ministry