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He was a friend of the poet Cyprian Norwid , wrote for the monthly Przegląd Warszawski ( The Warsaw Review ) , Echo ( The Echo ) and the monthly Biblioteka Warszawska ( The Warsaw Library , 1840 – 42 ) , and was secretary of the Board of Directors of the Warsaw Theaters ( Dyrekcja Warszawskich Teatrów ) .
 Cyprian Norwid, Warsaw, Warsaw, 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:
 Cyprian Norwid, Warsaw, Warsaw, Warsaw