What is on the wall?
The sign is on the wall.
    src        edge_attr  dst
0     0   to the left of   18
1     0  to the right of    1
2     0   to the left of    4
3     1   to the left of    4
4     1   to the left of   11
..  ...              ...  ...
58   19   to the left of   14
59   19   to the left of    2
60   19   to the left of   11
61   20  to the right of    1
62   20  to the right of   10

[63 rows x 3 columns]