On which side of the picture is the trailer?
The trailer is on the left of the image.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of    4
2     0   to the left of    3
3     0   to the left of   23
4     1  to the right of   20
5     1  to the right of    6
6     2  to the right of    0
7     2   to the left of    3
8     2   to the left of    4
9     2   to the left of   23
10    3  to the right of    0
11    3  to the right of    2
12    3   to the left of    4
13    3   to the left of   23
14    4  to the right of    0
15    4  to the right of    2
16    4   to the left of   23
17    4  to the right of    3
18    5  to the right of   20
19    6   to the left of    1
20    7   to the left of   12
21    7  to the right of    8
22    8   to the left of    7
23    8   to the left of   12
24   10               by   11
25   12  to the right of    8
26   12   to the left of   19
27   12  to the right of    7
28   12  to the right of   21
29   12  to the right of   13
30   12   to the left of   18
31   12  to the right of   16
32   12   to the left of   22
33   13   to the left of   19
34   13   to the left of   12
35   16   to the left of   12
36   16      attached to    8
37   16  to the right of   21
38   18  to the right of   12
39   19  to the right of   12
40   19  to the right of   13
41   20   to the left of    5
42   20   to the left of    1
43   21   to the left of   16
44   21   to the left of   12
45   22  to the right of   12
46   23  to the right of    2
47   23  to the right of    0
48   23  to the right of    4
49   23  to the right of    3