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