Which place is it?
It is a runway.
   src        edge_attr  dst
0    2  to the right of    3
1    3   to the left of    5
2    3   to the left of    4
3    3   to the left of    2
4    4  to the right of    3
5    5  to the right of    3
6    8  to the right of    9
7    9   to the left of    8