What kind of furniture is the dog on, a bed or a bookshelf?
The dog is on a bookshelf.
    src        edge_attr  dst
0     0   to the left of    8
1     0   to the left of    4
2     1   to the left of    5
3     2   to the left of    7
4     3   to the left of    7
5     4               on    0
6     4  to the right of    0
7     5  to the right of    1
8     7  to the right of    2
9     7  to the right of    3
10    8  to the right of    0
11    9               on    6