Sorted edges (pairs of vertices a and b with a < b) on a cube.
1, 2, 1, 4, 1, 5, 2, 3, 2, 6, 3, 4, 3, 7, 4, 8, 5, 6, 5, 8, 6, 7, 7, 8
1
The vertices are labeled 1 to 8. Each edge appears only once.
T. D. Noe, Plot of 12 pairs
T. D. Noe, Points on a cube
Eric W. Weisstein, MathWorld: Cube
nonn,full
T. D. Noe, Jan 29 2016