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He rose to the level of Lt. Commander of the 4th Commando Brigade in the Biafra n Army during the Nigerian Civil War , and later served with the Anyanya rebels in southern Sudan .
 Biafra
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Biafra