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The brothers ' cadetships were obtained through a friend of their father 's , Sir Walter Scott , who was extremely friendly with Robert Dundas and others with a Scottish background who had been or were at the Board of Control .
 person: Sir Walter Scott
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Sir Walter Scott 
Answer:
 person: Sir Walter Scott