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Tigh proved himself a competent battlestar commander multiple times : In Robert Thurston 's novel version of " Saga of a Star World " , however , Thurston wrote that Tigh had never been able to keep his feelings hidden .
 person: Robert Thurston; person: Thurston
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 Thurston, Thurston 
Answer:
 person: Robert Thurston; person: Thurston