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The Master 's title was deliberately chosen by producer Barry Letts and script editor Terrance Dicks because , like the Doctor , it was a title conferred by an academic degree .
 person: Barry Letts; person: Terrance Dicks
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Barry Letts; person: Terrance Dicks