Do you see any airplanes or trucks in the photograph?
Yes, there are airplanes.
   src        edge_attr  dst
0    3               in    5
1    3   to the left of    6
2    3   to the left of    4
3    4   to the left of    6
4    4  to the right of    3
5    6  to the right of    4
6    6  to the right of    3