What material is the fence that is to the right of the train?
The fence is made of metal.
    src        edge_attr  dst
0     0  to the right of   10
1     0  to the right of    4
2     0  to the right of    1
3     0  to the right of    6
4     0   to the left of    5
5     1   to the left of    0
6     1   to the left of    9
7     1   to the left of    7
8     1   to the left of    5
9     1   to the left of    8
10    2   to the left of    7
11    2   to the left of    9
12    4               on    1
13    4   to the left of    0
14    4   to the left of    7
15    4   to the left of    6
16    4   to the left of    8
17    4   to the left of   10
18    4   to the left of    9
19    5  to the right of    0
20    5  to the right of    1
21    5  to the right of    6
22    5  to the right of   10
23    6   to the left of    0
24    6  to the right of    4
25    6   to the left of    5
26    7  to the right of    2
27    7  to the right of    4
28    7  to the right of    1
29    8  to the right of    4
30    8  to the right of    1
31    9  to the right of    4
32    9  to the right of    2
33    9  to the right of    1
34   10               in    7
35   10   to the left of    5
36   10               in    9
37   10   to the left of    0
38   10  to the right of    4