What is the color of the vehicle the man is waiting for?
The bus is white.
    src        edge_attr  dst
0     0   to the left of    3
1     1   to the left of   13
2     3  to the right of    0
3     3  to the right of   10
4     3  to the right of   17
5     3   to the left of   11
6     4   to the left of    5
7     4   to the left of   14
8     5          wearing   14
9     5          next to   16
10    5             near   16
11    5   to the left of   16
12    5      waiting for    3
13    5  to the right of    4
14    7  to the right of   17
15    8   to the left of   11
16   10   to the left of    3
17   11  to the right of    8
18   11  to the right of    3
19   12               in    9
20   13  to the right of    1
21   14  to the right of    4
22   14   to the left of   16
23   16  to the right of    5
24   16             near    5
25   16  to the right of   14
26   17         carrying   10
27   17   to the left of    7
28   17   to the left of    3
29   17          holding   10
30   18          wearing    6