Are there zebras or cows?
Yes, there is a cow.
    src        edge_attr  dst
0     1  to the right of    5
1     1  to the right of   14
2     1  to the right of   11
3     1  to the right of   12
4     2   to the left of   16
..  ...              ...  ...
58   18   to the left of    5
59   19   to the left of   10
60   19   to the left of    9
61   19   to the left of    7
62   19   to the left of    5

[63 rows x 3 columns]