Is the van to the right or to the left of the person that is pulling a suitcase?
The van is to the right of the person.
     src        edge_attr  dst
0      0   to the left of    2
1      0   to the left of    9
2      0        pulled by   15
3      1   to the left of    3
4      1   to the left of    9
..   ...              ...  ...
196   35   to the left of   16
197   35  to the right of   18
198   36   to the left of    2
199   36   to the left of    9
200   36        pulled by   15

[201 rows x 3 columns]