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In particular , early Aboriginal people are thought to have been fire-stick farmers using fire regularly and persistently to drive game , open up dense thickets of vegetation , and create fresh green regrowth for both humans and game animals to eat .
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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:
 None