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The question of why these leaders had pleaded guilty and confessed to various crimes at the trials had become a topic of discussion for a number of western writers , and helped inspire anti-Communist tracts such as George Orwell 's " Nineteen Eighty-Four " and Arthur Koestler 's " Darkness at Noon " .
 person: George Orwell; person: Arthur Koestler
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: George Orwell, Arthur Koestler 
Answer:
 person: George Orwell; person: Arthur Koestler