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