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Economic Community of West African States ( ECOWAS ) would be responsible for the implementation of the military terms of the agreement while the United Nations would supervise , very much in the background .
 Economic Community of West African States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Economic Community of West African States