Who is waiting for the train?
The children are waiting for the train.
    src        edge_attr  dst
0     0   to the left of   17
1     0   to the left of   15
2     1   to the left of   15
3     1   to the left of    6
4     1   to the left of   14
..  ...              ...  ...
61   17  to the right of   16
62   17  to the right of   13
63   18   to the left of    8
64   18   to the left of    9
65   18   to the left of    7

[66 rows x 3 columns]