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In the case of chaparral plant communities , many species ' seeds require fire scarification to achieve germination ; an exception to that phenomenon is Western poison oak , whose thick seed coatings provide a time delayed effect for germination , but do not require fire scarification .
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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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