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William Hundley " Bill " Emerson ( born January 22 , 1938 in Washington , D.C. ) is an America n five-string banjo player known for being one of the founding members of the original Country Gentlemen and Emerson & Waldron .
 Bill, Emerson, Washington , D.C., America, Emerson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bill, Emerson, Washington , D.C., America, Emerson