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Plot The story opens with Armstrong and his colleague Ferdy Foxwell returning from a six-week mission aboard a nuclear submarine during which they gathered data on Soviet communications and electronic warfare techniques in the Arctic Ocean .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None