What is on the couch?
The pillows are on the couch.
   src        edge_attr  dst
0    0   to the left of    5
1    0   to the left of    4
2    1             near    4
3    3               on    0
4    4             near    1
5    4  to the right of    0
6    5               on    2
7    5  to the right of    0