sfgraph/data/03.txt

# this file has 9 nodes, 16 edges
1
2
3
4
5
6
7
8
9
1 2
1 3
1 4
1 5
5 6
5 7
8 7
9 8
9 6
6 7
4 9
4 8
4 5
2 3
2 9
2 6