The M22Graph command creates the M22 graph.

The M22 graph is a 16-regular graph with 77 vertices and 616 edges.

$\mathrm{with}\left(\mathrm{GraphTheory}\right)\:$

$\mathrm{with}\left(\mathrm{SpecialGraphs}\right)\:$

$G≔\mathrm{M22Graph}\left(\right)$

$G≔\mathrm{Graph\; 1:\; an\; undirected\; graph\; with\; 77\; vertices\; and\; 616\; edge(s)}$

$\mathrm{IsStronglyRegular}\left(G\,'\mathrm{parameters}'\right)$

$\mathrm{true},\left[16\,0\,4\right]$

$\mathrm{ChromaticNumber}\left(G\right)$

$5$

"M22 graph", Wikipedia. http://en.wikipedia.org/wiki/M22_graph

The GraphTheory[SpecialGraphs][M22Graph] command was introduced in Maple 2020.

For more information on Maple 2020 changes, see Updates in Maple 2020.