What are the leaves on?
The leaves are on the ceiling.
    src        edge_attr  dst
0     0   to the left of    5
1     0   to the left of   10
2     0  to the right of    1
3     1   to the left of    0
4     1   to the left of   13
5     1   to the left of    7
6     1   to the left of    9
7     1   to the left of   11
8     1   to the left of   12
9     1   to the left of    2
10    1   to the left of    3
11    1   to the left of    6
12    1   to the left of    8
13    1   to the left of    4
14    2               on   13
15    2  to the right of    1
16    3   to the left of   15
17    3  to the right of    1
18    3   to the left of    5
19    3  to the right of   11
20    4               in    5
21    4  to the right of    1
22    5  to the right of    3
23    5   to the left of   10
24    5  to the right of    0
25    6  to the right of    1
26    6   to the left of   15
27    7  to the right of    1
28    7  to the right of   12
29    7               on   12
30    8  to the right of    1
31    8   to the left of   15
32    9  to the right of    1
33   10  to the right of    0
34   10  to the right of   15
35   10  to the right of    5
36   11               by    3
37   11  to the right of    1
38   11   to the left of   15
39   11   to the left of    3
40   12   to the left of    7
41   12  to the right of    1
42   13  to the right of    1
43   15   to the left of   10
44   15  to the right of    3
45   15  to the right of   11
46   15  to the right of    6
47   15  to the right of    8