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John S. Dyer , a family friend who was Chief Clerk at the Admiralty and Secretary of Greenwich Hospital ( and who would later become his father-in-law ) , obtained a position for Meredith as a midshipman aboard a ship in the Royal Navy .
 Admiralty, Greenwich, 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, Greenwich, Royal Navy