Is this a bus or a truck?
This is a truck.
   src        edge_attr  dst
0    0   to the left of    2
1    0   to the left of    9
2    2  to the right of    0
3    2   to the left of    5
4    5  to the right of    2
5    5  to the right of    9
6    6   to the left of    7
7    7  to the right of    6
8    9  to the right of    0
9    9   to the left of    5