Which side of the image is the mirror on?
The mirror is on the left of the image.
    src        edge_attr  dst
0     0  to the right of    1
1     0  to the right of   13
2     1   to the left of    0
3     3  to the right of    9
4     6  to the right of   15
5     9   to the left of    3
6    12   to the left of   16
7    13   to the left of    0
8    15  to the right of   16
9    15   to the left of    6
10   15               on   14
11   16   to the left of   15
12   16  to the right of   12