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In 1941 he moved to the Government Code and Cypher School at Bletchley Park where he assessed decrypted messages sent by the German Luftwaffe .
 Government Code and Cypher School, Luftwaffe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Government Code and Cypher School, Luftwaffe