What is the forest filled with?
The forest is filled with trees.
    src        edge_attr  dst
0     0  to the right of   32
1     0  to the right of   19
2     1  to the right of   32
3     2  to the right of    6
4     3  to the right of   32
..  ...              ...  ...
95   35  to the right of   12
96   35  to the right of   10
97   35  to the right of   17
98   35  to the right of   14
99   35  to the right of   19

[100 rows x 3 columns]