How long is the water?
The water is long.
    src        edge_attr  dst
0     0             near    2
1     1  to the right of    6
2     2             near    5
3     2   to the left of    5
4     2             near    0
5     4  to the right of    6
6     5             near    2
7     5  to the right of    2
8     6   to the left of    1
9     6   to the left of    4
10    6               of    1