What is the sign on?
The sign is on the wall.
    src        edge_attr  dst
0     2   to the left of    5
1     2   to the left of    3
2     3  to the right of    4
3     3  to the right of    2
4     4               on    2
5     4   to the left of    3
6     4   to the left of    5
7     5  to the right of    4
8     5  to the right of    2
9     8     reflected in    6
10    8  to the right of    9
11    9   to the left of    8
12    9     reflected in    6