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In his letter to Tytus Wojciechowski , a friend of the composer , dated 27 December 1828 , Frédéric mentioned that one of the former boarding school rooms was turned into his workplace .
 Frédéric
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Frédéric