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The origin may have been the Persian word " tigra " meaning ' pointed or sharp ' , and the Avestan word " tigrhi " ' arrow ' , perhaps referring to the speed of the tiger 's leap , although these words are not known to have any meanings associated with tigers .
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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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