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facets of a 5D polytope or 4-honeycomb are its 4-faces.

Ridge or (n - 2)-face

In related terminology, the -faces of an -polytope are called ridges (also subfacets). A ridge is seen as the boundary between exactly two facets of a polytope or honeycomb.

For example:
*The ridges of a 2D polygon or 1D tiling are its 0-faces or vertices.
*The ridges of

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