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He received several prizes for his compositions , including the Eighth Mainichi Music Prize in 1957 for String Quartet , which he had written while studying abroad , and Sixteenth Otaka Prize and the Twenty-first National Art Festival Award in 1968 for his Piano Concerto ( 1964 – 1967 ) which was commissioned by NHK .
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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:
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