Where is the trash?
The litter is at the station.
   src        edge_attr  dst
0    1  to the right of    4
1    2  to the right of    4
2    2             near    4
3    2               at    4
4    2  to the right of    5
5    4   to the left of    1
6    4   to the left of    2
7    4             near    2
8    5               at    4
9    5   to the left of    2