| 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: (0,4) (2,1) (8,1) (2,6) (7,4) (6,4) (1,5) (6,8) (2,4) (7,8) (0,8) (3,4) (1,4) (7,5) (6,1) (3,0) (3,6) (3,7). |