How is that lake?
The lake is calm.
    src        edge_attr  dst
0     1   to the left of   10
1     1   to the left of    3
2     1   to the left of    8
3     2   to the left of   10
4     2   to the left of    3
5     2   to the left of    8
6     3  to the right of    2
7     3  to the right of    1
8     3  to the right of    5
9     5   to the left of    3
10    5   to the left of    8
11    5   to the left of   10
12    7   to the left of    8
13    7   to the left of   10
14    8  to the right of    5
15    8  to the right of    2
16    8  to the right of    1
17    8  to the right of    7
18   10  to the right of    5
19   10  to the right of    1
20   10  to the right of    2
21   10  to the right of    7