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Trace the Edges

Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2

Here are five poyhedra:

Cube. Icosahedron. Octahedron. Tetrahedron Dodecahedron.

You can trace a path along all of the edges, without going over any edge twice, on only one of these shapes.

Which shape is it and how do you do it?