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A corner turning Propello Tetrahedron.
Propello Tetrahedron is a solid with 16 faces: 4 regular triangles and 12 kites. This solid has 4 threefold corners (where three kites join) and 12 fourfold corners (where three kites plus one triangle join). It is one of the rare solids that are self-dual.
The inventor designed a jumbling only axis system inside of this solid. All fourfold corners can turn. The other four corners can not turn.
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