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In April 2011 three of his wrestlers ( Yamamotoyama , Shirononami and Sakaizawa ) were forced to retire by the Japan Sumo Association because of match-fixing .
 Yamamotoyama, Sakaizawa, Japan Sumo Association
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Yamamotoyama, Sakaizawa, Japan Sumo Association