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In Robert Thurston 's novel version of Battlestar Galactica : The Saga Of A Star World , Thurston wrote that Boomer was a voracious reader who usually spent his off hours reading and called him cautious enough never to wager except on what was " surer than a sure thing " .
 None
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:  
Answer:
 None