What is the fence made of?
The fence is made of metal.
    src        edge_attr  dst
0     0  to the right of    4
1     0  to the right of    1
2     0  to the right of   10
3     1   to the left of    0
4     2     growing from    7
5     3     growing from    7
6     4     growing from    7
7     4   to the left of    0
8     4   to the left of    6
9     4   to the left of   13
10    4   to the left of    9
11    4   to the left of   11
12    4   to the left of   10
13    5           behind    8
14    6           around   11
15    6  to the right of    4
16    6  to the right of   13
17    6  to the right of    9
18    8      standing on    7
19    8          wearing    6
20    8      in front of    5
21    9   to the left of    6
22    9  to the right of    4
23    9   to the left of   11
24   10   to the left of    0
25   10  to the right of    4
26   11  to the right of    4
27   11  to the right of    9
28   11  to the right of   13
29   13   to the left of   11
30   13  to the right of    4
31   13   to the left of    6