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From 1948 to 1950 , Han studied kwon bup , which was a mixture of Chinese chuan fa methods and Shudokan karate , and earned a black belt in the art under Byung In Yoon .
 Han
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Han