Do you see a cow there?
Yes, there is a cow.
    src        edge_attr  dst
0     0  to the right of    4
1     0  to the right of    1
2     0  to the right of   21
3     1  to the right of    6
4     1  to the right of    5
..  ...              ...  ...
68   20  to the right of   17
69   21  to the right of    9
70   21   to the left of   16
71   21   to the left of    0
72   21  to the right of    5

[73 rows x 3 columns]