Is it a forest or a farm?
It is a forest.
    src        edge_attr  dst
0     0   to the left of    5
1     0   to the left of    8
2     4   to the left of    6
3     5  to the right of    7
4     5  to the right of    0
5     6               in    3
6     6  to the right of    4
7     7               in    3
8     7   to the left of    5
9     7   to the left of    8
10    8  to the right of    7
11    8  to the right of    0
12    9               on    8