What does the grass grow on?
The grass grows on the ground.
    src        edge_attr  dst
0     0      standing by    9
1     0   to the left of   15
2     0   to the left of    5
3     0   to the left of   19
4     0   to the left of    9
..  ...              ...  ...
73   19   to the left of   13
74   20   to the left of   11
75   20   to the left of    7
76   20  to the right of    9
77   20  to the right of   18

[78 rows x 3 columns]