What vehicle is to the left of the spectators?
The vehicle is a van.
    src        edge_attr  dst
0     1   to the left of    3
1     1  to the right of    5
2     1  to the right of   10
3     1  to the right of   16
4     2  to the right of    8
5     2  to the right of   19
6     2  to the right of   20
7     3  to the right of    1
8     4  to the right of   14
9     5   to the left of    1
10    6  to the right of   17
11    6   to the left of   13
12    6   to the left of   11
13    6  to the right of    9
14    7   to the left of   20
15    7   to the left of   19
16    8  to the right of    9
17    8  to the right of   18
18    8   to the left of   19
19    8  to the right of   17
20    8   to the left of    2
21    9   to the left of    8
22    9   to the left of   13
23    9  to the right of   17
24    9  to the right of   18
25    9   to the left of   20
26    9   to the left of   11
27    9   to the left of    6
28   10   to the left of   12
29   10   to the left of    1
30   11  to the right of    6
31   11  to the right of    9
32   11  to the right of   13
33   12  to the right of   10
34   13   to the left of   11
35   13  to the right of    9
36   13  to the right of    6
37   13   to the left of   20
38   13  to the right of   17
39   14   to the left of    4
40   16   to the left of    1
41   17   to the left of    9
42   17   to the left of    6
43   17   to the left of    8
44   17   to the left of   13
45   17  to the right of   18
46   18   to the left of    9
47   18   to the left of   17
48   18   to the left of    8
49   19  to the right of    7
50   19  to the right of    8
51   19  to the right of   20
52   19   to the left of    2
53   20   to the left of    2
54   20   to the left of   19
55   20  to the right of    7
56   20  to the right of    9
57   20  to the right of   13