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Izidor Hafner
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Demonstrations 561  580 of 817
Kakuro Puzzle
Mazes on a Torus
Two Points on a Polyhedron
Grouping the Faces That Belong to the Same Vertex of a Polyhedron
Mazes on Polyhedra
Mazes on Surfaces
The Sum of the Sines of a Sum and Difference of Two Angles
Structure of Double Triacontahedron
Flexible Frame
Double Rhombic Icosahedron
Polyhedron Faces Identification
Find the Number of Cubes Removed
Fourfold Triacontahedron
Threefold Rhombic Triacontahedron
Constructing the Regular Icosahedron
Counterexamples to Euler's Formula for Nonconvex Polyhedra
Honeycombs with Halves of a Rhombic Dodecahedron of the Second Kind
Generating 3D Figures with a Given Symmetry Group
Bricard's Flexible Octahedron
Inverse Function of a Trigonometric Function Game
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