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Lesław Bartelski ( September 8 , 1920 – March 27 , 2006 ) was a Polish writer , perhaps best known for his work , Warsaw Ghetto Thermopolye and his novel The Blood-stained Wings .
 Lesław Bartelski, Warsaw
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lesław Bartelski, Warsaw