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A key factor of their sound is the " Boss HM-2 Heavy Metal Pedal " , which was popularized by bands such as Entombed , Dismember and Edge of Sanity in the early 90 's .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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