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truncated tetrahedron

A truncated tetrahedron is one of the 13 Archimedean solids. It has 4 regular hexagonal faces, 4 equilateral triangle faces, 12 vertices and 18 edges (of two types). It can be constructed by truncating all 4 vertices of a regular tetrahedron at one third of the original edge length. The Schlegel diagram of a truncated tetrahedron represents it as a planar graph.
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