What is on the trees?
The leaves are on the trees.
    src        edge_attr  dst
0     0   to the left of   10
1     1            below    4
2     2          next to   10
3     2             near   10
4     3               on   10
5     4            above   10
6     5           behind   10
7     6               on    5
8     6  to the right of    9
9     7   to the left of   10
10    7          next to   10
11    7             near   10
12    7   to the left of    8
13    8  to the right of    7
14    9   to the left of    6
15   10      in front of    5
16   10             near    7
17   10  to the right of    7
18   10  to the right of    0
19   10             near    2