| 21. | In the planar undirected graph with 4 vertices and 5 edges.
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| 22. | The edges of the graph link the O and M vertices.
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| 23. | In the regular undirected graph with 81 vertices and 810 edges.
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| 24. | In the regular undirected graph with 27 vertices and 216 edges.
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| 25. | G / P, whose vertices are the members of P.
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| 26. | The morphisms are given by homotopy classes of edges between vertices.
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| 27. | Vertices of the tetrahedral cell centers of the 10-orthoplex.
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| 28. | This improves performance substantially for polytopes with large numbers of vertices.
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| 29. | In particular there is no action at the new vertices created.
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| 30. | Most cubanes have more complicated structures, usually with nonequivalent vertices.
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