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It is the largest city in East Africa and the seventh-largest in Africa , with a population of 12,798,650 .
 location: East Africa; location: Africa
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:
 location: East Africa; location: Africa