Is that water green or black?
The water is green.
   src        edge_attr  dst
0    0  to the right of    5
1    0  to the right of    4
2    3   to the left of    5
3    3   to the left of    4
4    4  to the right of    3
5    4   to the left of    0
6    4  to the right of    5
7    5   to the left of    0
8    5   to the left of    4
9    5  to the right of    3