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After returning to England in November 1817 , he was appointed to the frigate , HMS Iphigenia , under Captain Robert Mends in the West Africa Squadron .
 Robert Mends, West Africa Squadron
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert Mends, West Africa Squadron