On which side is the mirror?
The mirror is on the left of the image.
    src        edge_attr  dst
0     0  to the right of    4
1     0  to the right of    9
2     1  to the right of    4
3     1  to the right of    9
4     3  to the right of    9
5     3  to the right of    4
6     4     reflected in    9
7     4   to the left of    3
8     4   to the left of    1
9     4   to the left of   11
10    4   to the left of    0
11    5  to the right of   10
12    6               in    2
13    7             near    8
14    8             near    7
15    9   to the left of   11
16    9   to the left of    0
17    9   to the left of    1
18    9   to the left of    3
19   10   to the left of    5
20   11  to the right of    9
21   11  to the right of    4