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In 1970 , Woodstock , Ontario based Warpig released their metal music debut , which , although never reaching mainstream success like fellow heavy metal bands Black Sabbath and Blue Cheer , has become a cult favorite within the Doom metal scene .
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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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