What is the depth of the water?
The water is deep.
   src        edge_attr  dst
0    0   to the left of    3
1    1               of    7
2    2               of    7
3    2   to the left of    3
4    3  to the right of    6
5    3  to the right of    0
6    3  to the right of    2
7    6               of    7
8    6   to the left of    3
9    7               in    5