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Upon the death of magnate Stanisław Koniecpolski ( March 1646 ) , an advocate of fair treatment of Cossacks , his successor , Aleksander , redrew the maps of his possessions .
 Stanisław Koniecpolski, Aleksander
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Stanisław Koniecpolski, Aleksander