Which side is the wagon on?
The wagon is on the right of the image.
    src        edge_attr  dst
0     1   to the left of    8
1     1   to the left of    6
2     1  to the right of   15
3     2               of    2
4     2   to the left of   18
5     2               on    7
6     2               in    7
7     3   to the left of   18
8     4  to the right of   10
9     4  to the right of   17
10    4  to the right of    9
11    6  to the right of    1
12    6  to the right of    7
13    7   to the left of    8
14    7   to the left of    6
15    8  to the right of    7
16    8  to the right of    1
17    9   to the left of    4
18   10   to the left of    4
19   13  to the right of   15
20   15               of    7
21   15   to the left of    1
22   15   to the left of   13
23   17               in   16
24   17   to the left of    4
25   18  to the right of    3
26   18  to the right of    2