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Other N-Sided: Four
Void MasterMorphixThis is a Void Cube with extensions that give it the shape of a tetrahedron.
Void PyraminxA Pyraminx with a hole.
Void Pyraminx DuoA Pyraminx duo with removed centers and then inner parts stickered.

Windmill PyraminxResembles an edges only Halpern-Meier-Tetrahedron.
Windmill TetraA Windmill Cube transformed into the shape of a tetrahedron.

XenomorphixA tetrahedron made from a 3x3x3. This one was "fishered". Means: Its axis system was twisted by 45 inside its solid.
Xenopix (Sharp Edges 580002000)A 3x3x3 truncated on four edges and afterwards extended. The result has four sides but looks like a pressed tetrahedron.
YJ Crazy PyraminxA mass produced variant of the Crazy Pyraminx without trivial tips but with independently turning circles.

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