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His youngest son , Yitzchak Eizik , died at the age of 11 ; two other sons , Yissachar Ber and Mordechai , were murdered by the Nazis in 1944 .
 Yissachar Ber, Mordechai
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Yissachar Ber, Mordechai