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In contrast , more rock-oriented country singers took more direct aim at the attacks ' perpetrators ; Toby Keith 's " Courtesy of the Red , White and Blue ( The Angry American ) " threatened to " a boot in " the posterior of the enemy , while Charlie Daniels 's " This Ai n't No Rag , It 's a Flag " promised to " hunt " the perpetrators " down like a mad dog hound .
 Toby Keith, Charlie Daniels, This Ai n't No Rag , It 's a Flag
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Toby Keith, Charlie Daniels, This Ai n't No Rag , It 's a Flag