What vehicles are black?
The vehicles are cars.
    src        edge_attr  dst
0     0      in front of    6
1     0           behind    8
2     0             near    4
3     0      in front of    2
4     0   to the left of    6
5     0   to the left of    2
6     0  to the right of    8
7     1            above    8
8     2  to the right of   10
9     2  to the right of    6
10    2  to the right of    0
11    2           behind    0
12    3          next to    4
13    3             near    4
14    3  to the right of    5
15    3  to the right of    4
16    3  to the right of    9
17    4          next to    0
18    4             near    3
19    4           beside    0
20    4   to the left of    9
21    4  to the right of    8
22    4   to the left of    3
23    5  to the right of    8
24    5   to the left of    3
25    5   to the left of    9
26    6           behind    0
27    6  to the right of    0
28    6   to the left of    2
29    7  to the right of    8
30    8      in front of    0
31    8            below    1
32    8   to the left of    5
33    8   to the left of    7
34    8   to the left of    9
35    8   to the left of    4
36    8   to the left of    0
37    9   to the left of    3
38    9  to the right of    4
39    9  to the right of    5
40    9  to the right of    8
41   10   to the left of    2