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In May of the same year , she also rescued some of the crew of the Soviet ship Tsiolkovskij after that vessel was eventually sunk by attacks from a German U-boat and two destroyer s. On 20 September 1942 , Lord Middleton was part of Convoy PQ-18 which was attacked by U-703 .
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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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