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Schimmen van schoonheid ( English " Shades of beauty " ) is a collection of short stories , written by Louis Couperus and published by Van Holkema & Warendorf in 1912 .
 Louis Couperus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Louis Couperus