The Heawood graph is the Levi graph of the Fano plane. It is a bipartite graph with 2 parts of 7 vertices each.
The black vertices denote vertices of the Fano plane, and the white vertices denote edges of the Fano plane.
E.g. vertex 3 is part of the circular edge (3, 5, 6), the diagonal edge (4, 7, 3), and the side edge (1, 3, 2).
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