Mathematikus: Cube made of three strips https://www.mathematikus.de/zh/crafting-and-folding-of-beautiful-objects/cube-made-of-three-strips
If you throw your cube up in the air and it does not fall apart, you have done a
If you throw your cube up in the air and it does not fall apart, you have done a
solve many daily life problems: When you listen to a description of a route, you have
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