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The word " circle " derives from the Greek κίρκος / κύκλος ( " kirkos / kuklos " ) , itself a metathesis of the Homeric Greek κρίκος ( " krikos " ) , meaning " hoop " or " ring " .
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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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