What is the color of the car that is to the left of the other cars?
The car is blue.
    src        edge_attr  dst
0     0   to the left of   12
1     1  to the right of    8
2     1  to the right of    7
3     1  to the right of    6
4     4        on top of    1
5     4  to the right of    7
6     6   to the left of    1
7     7  to the right of    9
8     7   to the left of    1
9     7  to the right of    8
10    7   to the left of    4
11    8   to the left of    1
12    8   to the left of    7
13    8               on   10
14    8  to the right of    9
15    9   to the left of    7
16    9   to the left of    8
17   12  to the right of    0