Do you see surfboards in the green water?
No, there is a paddle in the water.
    src        edge_attr  dst
0     0   to the left of   13
1     2               on    1
2     3   to the left of    7
3     4               in    1
4     7  to the right of    3
5     9   to the left of   11
6     9   to the left of   13
7    10   to the left of   11
8    11  to the right of    9
9    11  to the right of   10
10   13  to the right of    0
11   13               in    8
12   13  to the right of    9