What vehicle is to the right of the vehicle the van is to the left of?
The vehicle is a bus.
    src        edge_attr  dst
0     0   to the left of    1
1     1  to the right of    7
2     1  to the right of    0
3     2  to the right of    3
4     3   to the left of    2
5     4   to the left of    7
6     4  to the right of    9
7     5  to the right of   10
8     5  to the right of    8
9     6  to the right of    8
10    6  to the right of   10
11    7  to the right of    4
12    7   to the left of    1
13    8   to the left of    6
14    8   to the left of    5
15    9   to the left of    4
16   10   to the left of    5
17   10   to the left of    6