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HMS Elk was a 482 ton displacement , 16 gun Acorn-class brig-sloop of the Royal Navy launched on 29 September 1847 from the Chatham Dockyard .
 Royal Navy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Royal Navy