Is the fence made of wood gray or yellow?
The fence is gray.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of    6
2     0   to the left of   11
3     0   to the left of   17
4     0   to the left of    7
5     1               of   15
6     1   to the left of   17
7     1   to the left of   11
8     1   to the left of    7
9     1   to the left of    6
10    1   to the left of   12
11    4   to the left of   17
12    4   to the left of    7
13    5   to the left of   17
14    5   to the left of    8
15    6  to the right of   12
16    6  to the right of    0
17    6               of   15
18    6  to the right of    1
19    7  to the right of    1
20    7  to the right of   15
21    7  to the right of   12
22    7  to the right of    4
23    7  to the right of   14
24    7  to the right of    0
25    8  to the right of   14
26    8  to the right of   15
27    8  to the right of    5
28   11  to the right of    1
29   11  to the right of    0
30   12   to the left of    6
31   12   to the left of    7
32   12  to the right of    1
33   12  to the right of    0
34   14   to the left of    8
35   14   to the left of   17
36   14   to the left of    7
37   15   to the left of    7
38   15               by   18
39   15   to the left of   17
40   15   to the left of    8
41   17  to the right of    0
42   17  to the right of   14
43   17  to the right of    5
44   17  to the right of    1
45   17  to the right of    4
46   17  to the right of   15