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The operation began in response to United Nations Security Council Resolution 781 , which established a ban on the use of military aircraft in Bosnian airspace , and requested the aid of member states in monitoring compliance .
 organization: Nations Security
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Nations Security