Do you see a lamp or a mirror in this scene?
Yes, there is a mirror.
    src        edge_attr  dst
0     0  to the right of   13
1     0  to the right of    1
2     1  to the right of   13
3     1   to the left of    0
4     2  to the right of   19
..  ...              ...  ...
76   20  to the right of   13
77   21   to the left of   12
78   21  to the right of   19
79   21   to the left of    3
80   21   to the left of    8

[81 rows x 3 columns]