Are there either butterflies or calves?
No, there are no butterflies or calves.
     src        edge_attr  dst
0      0   to the left of   22
1      0   to the left of   24
2      0   to the left of   23
3      0  to the right of    2
4      0   to the left of   25
..   ...              ...  ...
125   26  to the right of   21
126   26  to the right of   12
127   27  to the right of   21
128   27               on   28
129   28  to the right of   21

[130 rows x 3 columns]