What do the men in front of the vehicle hold?
The men hold the tennis racket.
    src         edge_attr  dst
0     0   to the right of   11
1     0                of   16
2     0   to the right of    3
3     1                of   16
4     2                of   16
5     2   to the right of    3
6     3   to the right of    5
7     3           holding   17
8     3    to the left of    2
9     3    to the left of   14
10    3       in front of   12
11    3  standing next to   16
12    3       in front of   10
13    3    to the left of   16
14    3    to the left of    0
15    3              near    4
16    3           wearing    9
17    4           wearing    5
18    4    to the left of   17
19    4           next to    3
20    4    to the left of    6
21    5    to the left of   17
22    5    to the left of   11
23    5    to the left of    3
24    6                of    3
25    6    to the left of   14
26    6   to the right of    4
27    6    to the left of   16
28    7                of   16
29    8                of    3
30    9                on    6
31    9    to the left of   14
32    9    to the left of   16
33   10            behind    3
34   11    to the left of    0
35   11    to the left of   14
36   11   to the right of    5
37   11    to the left of   16
38   12            behind    3
39   13    to the left of   16
40   14   to the right of   17
41   14   to the right of    3
42   14   to the right of    6
43   14   to the right of    9
44   14   to the right of   11
45   15    to the left of   16
46   15                of    3
47   16   to the right of    9
48   16   to the right of   13
49   16   to the right of   11
50   16   to the right of   17
51   16   to the right of    3
52   16   to the right of   15
53   16   to the right of    6
54   17    to the left of   16
55   17    to the left of   14
56   17   to the right of    4
57   17   to the right of    5