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Corvette s Stockholm class Göteborg class Visby class Minesweeper s Koster class Styrsö class Landsort class Submarine s Gotland class Södermanland class Deep Submergence Rescue Vehicle Minelayer s Patrol boat s Auxiliary ship s Command ships Submarine salvage vessels Tungdykfartyg Torpedo salvage vessels Transport vessels Special vessels Training ship s Schooner s Ships for navigation education External links
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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:
 None