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On November 25 , 2006 , rebels captured the eastern town of Abeche , capital of the Ouaddaï Region and center for humanitarian aid to the Darfur region in Sudan .
 Abeche, Ouaddaï Region, Darfur, Sudan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Abeche, Ouaddaï Region, Darfur, Sudan