What piece of furniture is the chair at?
The chair is at the desk.
   src        edge_attr  dst
0    0   to the left of    5
1    0  to the right of    3
2    1               at    2
3    3               at    2
4    3   to the left of    0
5    5  to the right of    6
6    5  to the right of    0
7    6   to the left of    5