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sltmac(½ð±Ò+1): 2011-11-29 08:53:38
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The surface¡¯s shape of its top and bottom is dependant on the basic duality of its shell index (k). When k = odd number, they are extensions of the triangle shape with only threefold symmetry. While k = even, they are extensions of the hexagon shape with sixfold symmetry.
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