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