| 摘要 |
Blank for a folding puzzle has a square base surface (1). An inner square surface (2) marked on the base surface has corners (3) touching the middle of the edges of the base surface. The base surface is slit along its diagonals (4, 5) in the region of the inner square surface. The edge lines (2a-d) of the inner square surface form bending folds. Preferred Features: The blank is made of a tear-resistant, thin cardboard sheet.
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