What is the fence made of?
The fence is made of brick.
    src        edge_attr  dst
0     0   to the left of   17
1     0   to the left of    9
2     0   to the left of   15
3     0   to the left of    8
4     0  to the right of   13
5     1     growing near   13
6     1   to the left of   11
7     2   to the left of   15
8     2   to the left of    9
9     2  to the right of   13
10    2   to the left of    8
11    2   to the left of   17
12    2  to the right of   16
13    3   to the left of   10
14    3  to the right of    4
15    4               in    7
16    4   to the left of    9
17    4  to the right of   11
18    4   to the left of    3
19    7   to the left of   14
20    7   to the left of   10
21    8     growing near   17
22    8  to the right of    0
23    8  to the right of   15
24    8  to the right of    9
25    8  to the right of    2
26    9   to the left of    8
27    9   to the left of   14
28    9  to the right of    2
29    9   to the left of   10
30    9  to the right of    0
31    9  to the right of    4
32   10     growing near   13
33   10  to the right of    3
34   10  to the right of    7
35   10  to the right of    9
36   11     growing near   13
37   11  to the right of    1
38   11   to the left of    4
39   13   to the left of    0
40   13   to the left of    2
41   14  to the right of    9
42   14  to the right of    7
43   15   to the left of    8
44   15  to the right of    0
45   15  to the right of    2
46   16   to the left of    2
47   16     growing near   13
48   17  to the right of    2
49   17  to the right of    0