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The Angola train attack was an attack during the Angolan Civil War when on 10 August 2001 UNITA forces derailed a train travelling between towns of Zenza and Dondo with an anti-tank mine and then attacked the passengers with small arms fire .
 Angola, UNITA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Angola, UNITA