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He is well known for his portrayal of the fourth incarnation of the Doctor in the science fiction television series " Doctor Who " from 1974 to 1981 , a longer tenure than any other actor in the title role , and provided narration in the television comedy series " Little Britain " .
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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:
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