What does that player serve?
The player serves a tennis ball.
    src        edge_attr  dst
0     0  to the right of   10
1     1          wearing    4
2     1  to the right of    9
3     2  to the right of   12
4     3  to the right of    6
5     4  to the right of    6
6     5   to the left of    8
7     5   to the left of   12
8     6   to the left of    3
9     6   to the left of    4
10    8  to the right of    5
11    9   to the left of    1
12   10   to the left of    0
13   12          wearing    0
14   12   to the left of    2
15   12  to the right of    5
16   12          holding   10
17   12          serving    2
18   12          wearing    8