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Its traditional measure is the width of a person 's thumb at the knuckle , whereas the width of the two forefingers denotes 1.5 cun and the width of all fingers side-by-side is three cuns .
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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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