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In China, 20ᵗʰ century, a unit of length, = 10 fen = 3 ¹⁄₃ centimeters. 
It was in use with other values before the Qin Dynasty. In concept the cun is the width of the thumb, thus belongs to that class of body units.
United Nations, 1966.
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Last revised: 8 August 2005.