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Steel-string guitars are also important in the world of flatpicking , as utilized by such artists as Clarence White , Tony Rice , Bryan Sutton , Doc Watson and David Grier .
 Clarence White, Tony Rice, Bryan Sutton, Doc Watson, David Grier
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Clarence White, Tony Rice, Bryan Sutton, Doc Watson, David Grier