Do you see either any cones or mirrors in the image?
Yes, there is a mirror.
    src        edge_attr  dst
0     1   to the left of   10
1     3  to the right of   22
2     3   to the left of   19
3     4   to the left of   10
4    10  to the right of   12
5    10  to the right of    4
6    10  to the right of    1
7    11   to the left of   19
8    12   to the left of   10
9    16   to the left of   19
10   17   to the left of   20
11   19  to the right of   21
12   19  to the right of   16
13   19  to the right of    3
14   19  to the right of   11
15   19  to the right of   22
16   20  to the right of   17
17   21   to the left of   19
18   22   to the left of    3
19   22   to the left of   19