What is on the roof?
The flag is on the roof.
     src        edge_attr  dst
0      0   to the left of   20
1      0   to the left of   25
2      0   to the left of    2
3      0  to the right of    3
4      0   to the left of    4
..   ...              ...  ...
212   25  to the right of    0
213   25   to the left of    6
214   25   to the left of   12
215   25   to the left of    4
216   25   to the left of    5

[217 rows x 3 columns]