What color is the van to the left of the fence?
The van is green.
    src        edge_attr  dst
0     0   to the left of   18
1     0  to the right of    2
2     1   to the left of   14
3     1   to the left of   18
4     1  to the right of    5
5     1   to the left of    4
6     2   to the left of   18
7     2   to the left of    0
8     3  to the right of    8
9     3   to the left of   17
10    4  to the right of    1
11    4  to the right of   14
12    4   to the left of   17
13    5   to the left of   14
14    5   to the left of    1
15    5   to the left of    8
16    8   to the left of    3
17    8   to the left of   14
18    8  to the right of    5
19    8   to the left of   17
20    8   to the left of   18
21   11   to the left of   18
22   12  to the right of   16
23   13   to the left of   15
24   14  to the right of    1
25   14   to the left of    4
26   14  to the right of    5
27   14  to the right of    8
28   14   to the left of   17
29   14   to the left of   18
30   15  to the right of   13
31   16   to the left of   12
32   17  to the right of    8
33   17  to the right of    4
34   17  to the right of    3
35   17  to the right of   14
36   18  to the right of    1
37   18  to the right of    2
38   18  to the right of    0
39   18  to the right of    8
40   18  to the right of   11
41   18  to the right of   14