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Level 1: Stage 2
BIPYRAMID
What you need
3 octafold segments
(3 pairs of triangle segments).
Basic traits
Equilateral triangle faces: 6
Vertices: 5
Edges: 9
!
The triangular bipyramid (or dipyramid) is, as its name implies, two (bi-) pyramids combined. It is known as the Johnson solid number 12, or in short, J12.
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