What is the color of the fence?
The fence is black.
    src        edge_attr  dst
0     0   to the left of   12
1     0  to the right of   11
2     0   to the left of    9
3     0   to the left of    4
4     1  to the right of    6
5     1  to the right of   15
6     1  to the right of   12
7     2  to the right of   11
8     2   to the left of    4
9     3  to the right of   10
10    3   to the left of   12
11    3  to the right of   16
12    4  to the right of    0
13    4  to the right of    7
14    4  to the right of    2
15    4  to the right of   14
16    4  to the right of   10
17    6   to the left of    1
18    7  to the right of   11
19    7   to the left of   16
20    7   to the left of    4
21    8               on    5
22    9  to the right of    0
23    9  to the right of   10
24   10  to the right of   11
25   10   to the left of    3
26   10   to the left of    9
27   10   to the left of   12
28   10   to the left of    4
29   11   to the left of    0
30   11   to the left of    7
31   11           behind   15
32   11   to the left of   14
33   11   to the left of   10
34   11   to the left of    2
35   12  to the right of   15
36   12  to the right of   10
37   12  to the right of    3
38   12   to the left of    1
39   12  to the right of    0
40   12     driving down    6
41   13   to the left of   16
42   14               on   16
43   14  to the right of   11
44   14   to the left of    4
45   15   to the left of   12
46   15      in front of   11
47   15   to the left of    1
48   16  to the right of   13
49   16  to the right of    7
50   16   to the left of    3