Is this a train or a truck?
This is a truck.
     src        edge_attr  dst
0      0  to the right of   14
1      0  to the right of   12
2      0   to the left of   17
3      0   to the left of   22
4      0  to the right of   21
..   ...              ...  ...
199   27   to the left of   16
200   27   to the left of    5
201   27   to the left of    1
202   27   to the left of   24
203   27   to the left of   25

[204 rows x 3 columns]