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President Obama is now speaking at the African Leaders Summit . Watch LIVE : http://t.co/4NAFjrfD8O
 person: President Obama; location: African Leaders Summit
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: President Obama, African Leaders Summit 
Answer:
 person: President Obama; location: African Leaders Summit