What kind of vehicle is dark?
The vehicle is a van.
    src        edge_attr  dst
0     0   to the left of   11
1     0  to the right of    7
2     0  to the right of    8
3     0   to the left of   13
4     1  to the right of    8
5     1   to the left of   13
6     2   to the left of    6
7     2   to the left of   13
8     4  to the right of   10
9     4  to the right of   11
10    5   to the left of    7
11    6   to the left of   13
12    6  to the right of    8
13    6  to the right of    2
14    7  to the right of    8
15    7  to the right of    5
16    7   to the left of   13
17    7   to the left of    0
18    8   to the left of    0
19    8   to the left of    6
20    8   to the left of    1
21    8   to the left of    7
22   10   to the left of   15
23   10   to the left of    4
24   10   to the left of   11
25   11  to the right of   10
26   11   to the left of   15
27   11   to the left of    4
28   11  to the right of    0
29   13  to the right of    2
30   13  to the right of    7
31   13  to the right of    1
32   13  to the right of    6
33   13  to the right of   14
34   13  to the right of    0
35   14   to the left of   13
36   15  to the right of   11
37   15  to the right of   10