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Flight 544 was performing a reconnaissance mission for the United Nations Mission in South Sudan ( UNMISS ) to evaluate overland routes and landing areas for delivery of humanitarian aid .
 organization: Nations
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Nations 
Answer:
 organization: Nations