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When Beatty was appointed Commander-in-Chief , Grand Fleet , he took Brock with him to be his Chief of Staff from 1916 to 1919 .
 Commander-in-Chief, Grand Fleet, Brock
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Commander-in-Chief, Grand Fleet, Brock