Are both the wagon and the chain made of the same material?
No, the wagon is made of wood and the chain is made of metal.
    src        edge_attr  dst
0     0             near    4
1     0               on    3
2     0  to the right of    9
3     0  to the right of    6
4     0  to the right of    4
5     0  to the right of    8
6     1  to the right of    4
7     2  to the right of    7
8     2  to the right of   10
9     4   to the left of    0
10    4             near    0
11    4   to the left of    5
12    4   to the left of    1
13    5  to the right of    8
14    5  to the right of    4
15    6   to the left of    0
16    7   to the left of    2
17    8   to the left of    5
18    8   to the left of    0
19    9   to the left of    0
20    9   to the left of   10
21   10   to the left of    2
22   10  to the right of    9