Is this bus yellow?
No, the bus is red.
    src        edge_attr  dst
0     0   to the left of    3
1     1   to the left of    6
2     1   to the left of    4
3     2  to the right of    6
4     3  to the right of    0
5     4  to the right of    1
6     4   to the left of    6
7     5  to the right of    6
8     6   to the left of    2
9     6  to the right of    1
10    6  to the right of    4
11    6   to the left of    5