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 16, and the edges are: (0,6) (0,1) (0,3) (0,4) (0,15) (0,10) (1,5) (2,9) (2,8) (2,12) (2,7) (3,14) (3,9) (3,15) (3,5) (4,14) (4,9) (4,15) (4,5) (4,12) (5,14) (5,7) (6,15) (6,11) (6,12) (7,11) (7,12) (8,16) (9,11) (9,16) (11,12) (12,14).