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He won the Stratford electorate in the 1908 general election , and held it to 1919 , when he was defeated by Robert Masters of the Liberal Party .
 person: Robert Masters; organization: Liberal Party
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: Robert Masters, Liberal Party 
Answer:
 person: Robert Masters; organization: Liberal Party