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On 14 December 1917 , along with Lansquenet , she sank the German U-boat off Cape Ducato in the Ionian Sea after the submarine had torpedoed and sunk the light cruiser .
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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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