Who is serving the tennis ball?
The player is serving the tennis ball.
    src        edge_attr  dst
0     0   to the left of    5
1     0   to the left of    1
2     1  to the right of    0
3     1  to the right of    2
4     1          wearing    5
..  ...              ...  ...
72   26   to the left of    6
73   26   to the left of    9
74   27  to the right of    8
75   27  to the right of   28
76   28   to the left of   27

[77 rows x 3 columns]