Is the bus blue or white?
The bus is blue.
    src        edge_attr  dst
0     0  to the right of    8
1     0  to the right of    5
2     0  to the right of    1
3     1  to the right of    4
4     1   to the left of    0
5     2  to the right of    4
6     4   to the left of   10
7     4   to the left of   12
8     4   to the left of    1
9     4   to the left of    2
10    4   to the left of    5
11    4   to the left of    6
12    4     reflected in    3
13    5   to the left of   11
14    5   to the left of    0
15    5  to the right of    4
16    5  to the right of    7
17    5   to the left of    9
18    6  to the right of    4
19    7   to the left of    5
20    8   to the left of    0
21    9  to the right of    5
22   10  to the right of    4
23   11  to the right of    5
24   12  to the right of    4