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In Lebanon , the assassination of former Prime Minister Rafik Hariri on February 14 , 2005 , prompted an investigation by the United Nations .
 Lebanon, Rafik Hariri, United Nations
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lebanon, Rafik Hariri, United Nations