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In the ensuing by-election , Livingstone topped a field of six candidates and was elected to fulfill Gowan 's term , which lasted until the 1913 election .
 person: Livingstone; person: Gowan
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: Livingstone, Gowan 
Answer:
 person: Livingstone; person: Gowan