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removing:Norman Johnson discovered elongated triangular pyramids.{{Citation needed|date=November 2010}}–It's likely the structure itself was used before. The work of Johnson consisted in cataloguing, not discoveryÇ. |
→Dual polyhedron: Topologically, the elongated triangular pyramid is its own dual. Geometrically, the dual has seven irregular faces: four triangles and three trapezoids. |
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=== Dual polyhedron ===
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