What is the racket hitting?
The racket is hitting the tennis ball.
    src        edge_attr  dst
0     0   to the left of    7
1     1   to the left of    4
2     3  to the right of   14
3     4  to the right of    9
4     4   to the left of    6
5     4  to the right of    1
6     5           behind    8
7     6  to the right of    9
8     6  to the right of    4
9     7  to the right of    0
10    7               on    5
11    7  to the right of    8
12    8          wearing    4
13    8          wearing    6
14    8          wearing   11
15    8      in front of    5
16    8          hitting    1
17    8   to the left of    7
18    8          wearing   14
19    8         swinging    9
20    8          holding    9
21    8          wearing   13
22    8          wearing    0
23    8          wearing    3
24    8          wearing    2
25    9          hitting    1
26    9   to the left of    4
27    9   to the left of    6
28   14   to the left of    3