sfgraph/hypersfg/examples/grid.txt

0 1 1
0 4 1
1 2 1
1 5 1
2 3 1
2 6 1
3 7 1
4 5 1
4 8 1
5 6 1
5 9 1
6 10 1
6 7 1
7 11 1
8 12 1
8 9 1
9 13 1
9 10 1
10 14 1
10 11 1
11 15 1
12 13 1
13 14 1
14 15 1