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The Encyclopœdia of Sexual Knowledge , published in 1934 , is the first of a trilogy of sexual encyclopaedias by Arthur Koestler writing under the pen name of ‘ Dr. A. Costler ’ .
 Arthur Koestler
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Arthur Koestler