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Then , the Admiralty , desirous of quickly building up the Royal Navy , purchased a number of commercial vessels , including nine East Indiamen , to meet the need for small two-decker fourth rates to serve as convoy escorts .
 Admiralty, 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:
 Admiralty, Royal Navy