| In an undirected graph, (i,j) means that node i and node j are connected with an undirected edge. | |
| The nodes are numbered from 0 to 8, and the edges are: (6,5) (5,7) (0,6) (5,3) (4,3) (5,0) (6,7) (1,5) (0,8) (8,5) (5,2) (6,1) (7,8) (1,3) (0,7) (3,8) (3,2) (6,2). |