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Compound of four tetrahedra : ウィキペディア英語版 | Compound of four tetrahedra In geometry, a compound of four tetrahedra can be constructed by four tetrahedra in a number of different symmetry positions. One compound can be constructed rotating a tetrahedron by 45 degree turns along an axis of the middle of an edge. It has dihedral symmetry, D4 It has the same vertex arrangement as the convex octagonal prism. == External links ==
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