Which color is the ground?
The ground is brown.
   src        edge_attr  dst
0    0   to the left of   10
1    2   to the left of    8
2    3   to the left of    8
3    4               by    9
4    5               in    7
5    8  to the right of    3
6    8  to the right of    2
7    9  to the right of   10
8   10  to the right of    0
9   10   to the left of    9