中心点を囲む複数Nの展開図
index
1st 
---2nd 
---3rd 
---4th 
5th 
---6th 
---7th 
---8th 
9th 
---10th 
---11th 
---12th 
1st
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2nd
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3rd
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4th
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5th
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6th
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7th
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8th
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9th
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10th
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11th
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12th
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