Is the ladder on the left?
No, the ladder is on the right of the image.
    src        edge_attr  dst
0     0  to the right of   19
1     0  to the right of   17
2     0  to the right of   15
3     0  to the right of   13
4     0  to the right of    3
5     0  to the right of    1
6     0  to the right of   20
7     0  to the right of   16
8     0  to the right of   10
9     1  to the right of   20
10    1   to the left of    0
11    1   to the left of    9
12    2   to the left of   17
13    3   to the left of    0
14    3  to the right of   11
15    3  to the right of   15
16    6   to the left of   12
17    6   to the left of   11
18    8   to the left of   13
19    9  to the right of   19
20    9  to the right of   10
21    9  to the right of   13
22    9  to the right of   17
23    9  to the right of    1
24    9  to the right of   20
25   10   to the left of    9
26   10   to the left of    0
27   11  to the right of   12
28   11   to the left of   16
29   11   to the left of   15
30   11  to the right of    6
31   11   to the left of    3
32   12   to the left of   11
33   12  to the right of    6
34   12   to the left of   15
35   13   to the left of    0
36   13   to the left of    9
37   13  to the right of    8
38   14   to the left of   21
39   15   to the left of   16
40   15  to the right of   12
41   15  to the right of   11
42   15   to the left of    3
43   15   to the left of    0
44   16   to the left of    0
45   16  to the right of   11
46   16  to the right of   15
47   17  to the right of    2
48   17   to the left of    0
49   17   to the left of    9
50   19  to the right of   20
51   19   to the left of    9
52   19   to the left of    0
53   20   to the left of    9
54   20   to the left of    1
55   20   to the left of    0
56   20   to the left of   19
57   21  to the right of   14