describing its bifurcating Coxeter-Dynkin diagram, with a single ring on the end of the 4-node sequences, .

The rectified 4₂₁ is constructed by points at the mid-edges of the 4₂₁. The birectified 4₂₁ is constructed by points at the triangle face centers of the 4₂₁. The trirectified 4₂₁ is constructed by points at the tetrahedral centers of the 4₂₁.

These polytopes are part

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