What is full of leaves?
The branch is full of leaves.
    src        edge_attr  dst
0     1  to the right of    3
1     2               on    1
2     3   to the left of    1
3     4               on    1
4     4   to the left of    7
5     4               in    0
6     5               on    6
7     5   to the left of   10
8     7  to the right of    4
9     7  to the right of    8
10    7          full of    2
11    8   to the left of    7
12    8   to the left of    9
13    9  to the right of    8
14   10  to the right of    5
15   10               on    7