How thick is that fog?
The fog is thick.
    src        edge_attr  dst
0     0   to the left of   17
1     0   to the left of   11
2     0   to the left of   14
3     0   to the left of   18
4     1   to the left of    3
..  ...              ...  ...
58   19   to the left of    5
59   19   to the left of   12
60   20   to the left of   17
61   20  to the right of    9
62   20   to the left of   14

[63 rows x 3 columns]