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Mat Mathews , born Mathieu Hubert Wijnandts Schwarts ( June 18 , 1924 – February 12 , 2009 ) , was a Dutch jazz accordion ist .
 Mat Mathews, Dutch
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mat Mathews, Dutch