Which color is the tower that the car is behind of?
The tower is red.
    src        edge_attr  dst
0     3               on    7
1     4           behind    7
2     5           behind    7
3     5  to the right of    7
4     5  to the right of   10
5     6               in    0
6     6  to the right of   12
7     6  to the right of    7
8     7      in front of    5
9     7   to the left of    6
10    7   to the left of    5
11    7  to the right of    9
12    7      in front of    4
13    8           around    7
14    9   to the left of    7
15   10   to the left of    5
16   12   to the left of    6