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Ouolon is a small town and commune in the Cercle of San in the Ségou Region of Mali .
 Ouolon, Cercle of San, Ségou Region, Mali
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ouolon, Cercle of San, Ségou Region, Mali