Sorted edges (pairs of vertices a and b with a < b) on an dodecahedron.

1, 2, 1, 5, 1, 6, 2, 3, 2, 7, 3, 4, 3, 8, 4, 5, 4, 9, 5, 10, 6, 11, 6, 15, 7, 11, 7, 12, 8, 12, 8, 13, 9, 13, 9, 14, 10, 14, 10, 15, 11, 16, 12, 17, 13, 18, 14, 19, 15, 20, 16, 17, 16, 20, 17, 18, 18, 19, 19, 20

1

The vertices are labeled 1 to 20. Each edge appears only once.

T. D. Noe, Plot of 30 pairs

T. D. Noe, Points on a dodecahedron

Eric W. Weisstein, MathWorld: Dodecahedron

nonn,full

T. D. Noe, Jan 29 2016