What piece of furniture is the keyboard on?
The keyboard is on the table.
   src        edge_attr  dst
0    0   to the left of    7
1    1  to the right of    7
2    2               on    4
3    3   to the left of    7
4    7  to the right of    3
5    7  to the right of    0
6    7               on    4
7    7   to the left of    1