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Billy Yule , the younger and high-school-age brother of bassist Doug Yule , filled in the role of drummer for live performances and some of the songs on the album .
 Billy Yule, Doug Yule
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Billy Yule, Doug Yule