Do you see either a mirror or a flag that are small?
Yes, the mirror is small.
   src        edge_attr  dst
0    0   to the left of   11
1    0  to the right of    8
2    5   to the left of   11
3    8   to the left of    0
4    9  to the right of   14
5   11  to the right of    0
6   11  to the right of    5
7   14   to the left of    9