On which side is the mirror, the right or the left?
The mirror is on the left of the image.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of   10
2     1   to the left of   10
3     3  to the right of   12
4     4   to the left of   11
5     4   to the left of    9
6     5   to the left of    9
7     7               in    8
8     9  to the right of    4
9     9  to the right of    5
10   10  to the right of    1
11   10  to the right of    0
12   11  to the right of    4
13   12  to the right of    0
14   12   to the left of    3