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1962 – 21 October 2004 ) ( ) was the assistant of Mohammed Deif , the leader of the Izz ad-Din al-Qassam Brigades , the armed wing of Hamas .
 Mohammed Deif, Izz ad-Din al-Qassam Brigades, Hamas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Mohammed Deif, Izz ad-Din al-Qassam Brigades, Hamas