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Barry Letts had one man in mind for the role : Roger Delgado , who had a long history of screen villainy and had already made three attempts to break into the series .
 person: Barry Letts; person: Roger Delgado
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: Roger Delgado