Are there any zebras?
No, there are no zebras.
    src        edge_attr  dst
0     0   to the left of    4
1     0   to the left of   22
2     0   to the left of   13
3     0   to the left of    8
4     0   to the left of    5
..  ...              ...  ...
59   22  to the right of    9
60   23  to the right of   14
61   23  to the right of   16
62   23   to the left of    4
63   23  to the right of   19

[64 rows x 3 columns]