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Dugald Stewart Walker ( 1883 — 1937 ) was an early twentieth century illustrator .
 person: Dugald Stewart Walker
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: Dugald Stewart Walker 
Answer:
 person: Dugald Stewart Walker