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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 .
 Robert Thurston, Thurston
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert Thurston, Thurston