What is on the fence?
The sign is on the fence.
    src        edge_attr  dst
0     1  to the right of    2
1     1               on   13
2     1  to the right of    6
3     2  to the right of    9
4     2  to the right of    7
5     2   to the left of   12
6     2  to the right of    6
7     2   to the left of    1
8     4               on   11
9     5               on   10
10    5               on    0
11    6   to the left of   12
12    6   to the left of    1
13    6  to the right of    7
14    6   to the left of    2
15    7   to the left of    2
16    7   to the left of    6
17    7   to the left of   12
18    9   to the left of    2
19    9   to the left of   12
20    9               on   13
21   12  to the right of    9
22   12           riding    1
23   12  to the right of    2
24   12  to the right of    6
25   12  to the right of    7
26   12               on    1