Which kind of vehicle is the horse pulling?
The horse is pulling the carriage.
     src        edge_attr  dst
0      0  to the right of   21
1      0  to the right of   22
2      0   to the left of    3
3      0  to the right of    1
4      0  to the right of    7
..   ...              ...  ...
143   22        pulled by   21
144   22  to the right of   20
145   22  to the right of   21
146   23   to the left of   18
147   23   to the left of    9

[148 rows x 3 columns]