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The Athabasca Oil Sands contain the largest proven reserves of oil in the world outside Tar sands .
 Athabasca Oil Sands, Tar
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Athabasca Oil Sands, Tar