What vehicle is behind the small car?
The vehicle is a truck.
    src        edge_attr  dst
0     0          next to    1
1     0   to the left of   13
2     0             near    1
3     1             near    0
4     1   to the left of    6
5     1   to the left of    5
6     1   to the left of   10
7     1   to the left of    9
8     1   to the left of    2
9     1   to the left of    4
10    1  to the right of    3
11    1  to the right of   14
12    1   to the left of   17
13    2   to the left of   21
14    2  to the right of    1
15    3   to the left of    4
16    3   to the left of    1
17    4  to the right of    3
18    4  to the right of    1
19    4  to the right of   14
20    5   to the left of   21
21    5   to the left of    6
22    5  to the right of    1
23    6  to the right of    1
24    6  to the right of    5
25    6   to the left of   21
26    8  to the right of   13
27    9  to the right of    1
28    9   to the left of   21
29   10   to the left of   21
30   10           behind   21
31   10  to the right of    1
32   11  to the right of   18
33   12  to the right of   20
34   12  to the right of   13
35   12      in front of   13
36   13  to the right of    0
37   13   to the left of    8
38   13   to the left of   12
39   13           behind   12
40   14   to the left of    1
41   14   to the left of    4
42   17   to the left of   21
43   17  to the right of    1
44   18   to the left of   11
45   18   to the left of   20
46   20  to the right of   18
47   20   to the left of   12
48   21  to the right of    5
49   21  to the right of    6
50   21  to the right of    2
51   21      in front of   10
52   21  to the right of    9
53   21  to the right of   10
54   21  to the right of   17