What is the dog sitting on?
The dog is sitting on the table.
    src        edge_attr  dst
0     0  to the right of    4
1     0               of    8
2     0  to the right of    7
3     1   to the left of    8
4     4   to the left of    0
5     4   to the left of    8
6     5       sitting on    3
7     7   to the left of    0
8     7   to the left of    8
9     8  to the right of    1
10    8  to the right of    4
11    8       sitting on    3
12    8  to the right of    7