What is the color of the truck?
The truck is blue.
    src        edge_attr  dst
0     0  to the right of    4
1     1      in front of   10
2     1   to the left of    2
3     2      in front of   10
4     2  to the right of    1
5     3  to the right of    4
6     3   to the left of    8
7     4   to the left of    3
8     4   to the left of    8
9     4   to the left of    0
10    7  to the right of   12
11    8  to the right of    3
12    8  to the right of    4
13    9   to the left of   11
14   10   to the left of   11
15   10           behind    1
16   10           behind    2
17   11  to the right of    9
18   11  to the right of   10
19   11  to the right of   13
20   12   to the left of    7
21   13  to the right of   14
22   13   to the left of   11
23   14   to the left of   13