The van to the left of the car is what color?
The van is gray.
    src        edge_attr  dst
0     0   to the left of    3
1     0   to the left of   11
2     0   to the left of   14
3     0   to the left of    2
4     0   to the left of    7
5     1  to the right of   10
6     1   to the left of    2
7     1   to the left of   13
8     1   to the left of    3
9     1   to the left of    9
10    2  to the right of    9
11    2  to the right of    0
12    2  to the right of    1
13    2  to the right of   13
14    3  to the right of    9
15    3  to the right of   13
16    3  to the right of    0
17    3   to the left of    6
18    3  to the right of    1
19    5   to the left of    8
20    6  to the right of    3
21    6  to the right of    7
22    7               on    2
23    7   to the left of    6
24    7  to the right of    0
25    8  to the right of   11
26    8  to the right of   12
27    8  to the right of    5
28    9   to the left of    2
29    9               on    0
30    9  to the right of    1
31    9   to the left of   13
32    9   to the left of    3
33    9  to the right of   10
34   10               on    0
35   10   to the left of    9
36   10   to the left of    1
37   10   to the left of   13
38   11  to the right of    0
39   11               of   12
40   11   to the left of    8
41   12   to the left of    8
42   12         lying on    5
43   13   to the left of    3
44   13  to the right of    1
45   13  to the right of   10
46   13  to the right of    9
47   13   to the left of    2
48   14               on   12
49   14  to the right of    0