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