What color is the bus?
The bus is green.
    src        edge_attr  dst
0     0          driving    7
1     0  to the right of    4
2     2  to the right of    4
3     4               on    3
4     4   to the left of    2
5     4   to the left of    7
6     4   to the left of    0
7     5  to the right of    6
8     6  to the right of    9
9     6   to the left of    5
10    7               on    3
11    7  to the right of    4
12    9   to the left of    6