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The structure of the book is unusual ; it is divided into seven main chapters the first of which is a biography and the other six are descriptions and interpretations of each of Koestler ’s six novels .
 person: 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: Koestler 
Answer:
 person: Koestler