What is pulled by the animal that the person is to the left of?
The wagon is pulled by the horse.
     src       edge_attr  dst
0      0  to the left of    8
1      0  to the left of    7
2      0  to the left of   16
3      1  to the left of    6
4      1  to the left of    5
..   ...             ...  ...
110   20  to the left of    7
111   20  to the left of    8
112   20  to the left of    1
113   20  to the left of   17
114   20  to the left of   16

[115 rows x 3 columns]