Are there any mirrors?
Yes, there is a mirror.
    src        edge_attr  dst
0     0   to the left of   14
1     1               of    3
2     1   to the left of    6
3     2   to the left of    6
4     3  to the right of    5
5     4   to the left of    8
6     4  to the right of    6
7     5   to the left of    3
8     6  to the right of    2
9     6  to the right of    1
10    6  to the right of    7
11    6   to the left of    4
12    6               of    3
13    6  to the right of   12
14    6   to the left of   10
15    6  to the right of   15
16    6  to the right of   13
17    7   to the left of    6
18    7   to the left of   10
19    8  to the right of    4
20   10  to the right of    6
21   10  to the right of   12
22   10  to the right of    7
23   12   to the left of   10
24   12   to the left of    6
25   13   to the left of    6
26   13               of    3
27   14  to the right of    0
28   15   to the left of    6
29   15               of    3