On which side of the picture is the ladder?
The ladder is on the right of the image.
    src        edge_attr  dst
0     0   to the left of    7
1     0   to the left of    1
2     1   to the left of    7
3     1  to the right of    0
4     4  to the right of    9
5     4  to the right of    5
6     5   to the left of    4
7     7  to the right of    0
8     7  to the right of    1
9     7  to the right of    9
10    9   to the left of    7
11    9   to the left of    4