Is the truck to the right of the flag red or gray?
The truck is gray.
    src        edge_attr  dst
0     0          wearing    5
1     0          wearing    4
2     0  to the right of    8
3     2   to the left of    8
4     3               in   11
5     4  to the right of    8
6     6   to the left of   12
7     6  to the right of    8
8     7   to the left of   12
9     8               in    9
10    8   to the left of    6
11    8   to the left of    0
12    8               on    9
13    8   to the left of    4
14    8  to the right of    2
15   10               in   11
16   12               in    9
17   12               on    9
18   12  to the right of    6
19   12  to the right of    7