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Commissioned on 30 December 1941 , she served with the 5th U-Boat Flotilla until 31 July as a training boat , and as a front boat of 66th Flotilla under the command of Kapitänleutnant Karl-Horst Horn , until her sinking on 3 September 1942 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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