Do you see both a duck and a boat?
No, there is a duck but no boats.
    src        edge_attr  dst
0     0   to the left of    3
1     0   to the left of   21
2     0   to the left of    7
3     0   to the left of   16
4     0  to the right of   12
..  ...              ...  ...
70   19   to the left of   13
71   20   to the left of   13
72   20   to the left of    7
73   21  to the right of    0
74   21  to the right of   13

[75 rows x 3 columns]