Are there any windows?
Yes, there is a window.
     src        edge_attr  dst
0      0   to the left of   19
1      0   to the left of   20
2      0   to the left of   21
3      0  to the right of    9
4      0  to the right of   18
..   ...              ...  ...
227   27  to the right of   14
228   27   to the left of   26
229   27   to the left of   23
230   28   to the left of   10
231   28   to the left of    4

[232 rows x 3 columns]