Are there either vans or trucks?
Yes, there is a truck.
     src        edge_attr  dst
0      0   to the left of    2
1      0   to the left of    4
2      0   to the left of   13
3      0   to the left of   20
4      0          holding   15
..   ...              ...  ...
113   22  to the right of    4
114   22          wearing    4
115   22          wearing    3
116   22          wearing   13
117   22  to the right of    1

[118 rows x 3 columns]