What's the fence made of?
The fence is made of wood.
    src        edge_attr  dst
0     0           behind    4
1     0   to the left of    5
2     0  to the right of    1
3     0   to the left of   10
4     1           behind    4
5     1   to the left of    7
6     1   to the left of   12
7     1   to the left of    0
8     2   to the left of    5
9     2   to the left of   10
10    4             near    5
11    4      in front of    0
12    4      in front of    1
13    4   to the left of    6
14    4               in    3
15    4   to the left of    8
16    5             near    4
17    5  to the right of    0
18    5  to the right of   12
19    5  to the right of    2
20    6  to the right of   11
21    6  to the right of    9
22    6  to the right of   12
23    6  to the right of    4
24    7  to the right of    1
25    8  to the right of    4
26    9   to the left of    6
27    9   to the left of   11
28   10  to the right of    2
29   10  to the right of    0
30   11  to the right of   12
31   11  to the right of    9
32   11   to the left of    6
33   12  to the right of    1
34   12   to the left of    5
35   12   to the left of    6
36   12   to the left of   11