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President Olusegun Obasanjo declared a six-month state of emergency in Plateau State on 18 May 2004 .
 Olusegun Obasanjo, Plateau
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Olusegun Obasanjo, Plateau