Which kind of vehicle is the pole behind of?
The pole is behind the train.
    src        edge_attr  dst
0     0   to the left of    5
1     1  to the right of    7
2     4  to the right of    5
3     4  to the right of   13
4     4  to the right of   11
5     4        on top of   11
6     5  to the right of    0
7     5   to the left of   10
8     5  to the right of    8
9     5   to the left of    4
10    5               by   11
11    6      in front of   10
12    6           behind   11
13    6             near   11
14    6  to the right of   13
15    6  to the right of   11
16    6          next to   11
17    7           behind   11
18    7   to the left of    1
19    7   to the left of   12
20    7   to the left of   11
21    8   to the left of    5
22    8               in    0
23   10           behind    6
24   10  to the right of    5
25   10  to the right of   11
26   11  to the right of    7
27   11   to the left of   10
28   11      in front of    6
29   11      in front of    7
30   11             near    6
31   11   to the left of    4
32   11   to the left of    6
33   12  to the right of    7
34   13   to the left of    6
35   13   to the left of    4