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