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As Deputy Chief , Mr. Martinez served as the chief operating officer of the Office of the Chief of Protocol , as well as Acting Chief of Protocol in the absence of the Chief .
 Chief, Martinez, Chief, Protocol, Chief, Protocol, Chief
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chief, Martinez, Chief, Protocol, Chief, Protocol, Chief