What size are the trees?
The trees are small.
    src        edge_attr  dst
0     0  to the right of    2
1     0  to the right of   12
2     2  to the right of   10
3     2  to the right of    6
4     2   to the left of   12
5     2   to the left of    0
6     3  to the right of    9
7     3  to the right of   10
8     3  to the right of    5
9     3  to the right of   11
10    3            below    5
11    4   to the left of   13
12    5            above    3
13    5   to the left of    3
14    5   to the left of    9
15    6  to the right of   10
16    6   to the left of    2
17    6   to the left of   12
18    7  to the right of   10
19    7             near   13
20    9  to the right of    5
21    9  to the right of   11
22    9   to the left of    3
23   10   to the left of    2
24   10            below   14
25   10   to the left of    3
26   10   to the left of    7
27   10   to the left of    6
28   10   to the left of   12
29   11   to the left of    3
30   11   to the left of    9
31   12   to the left of    0
32   12  to the right of    2
33   12  to the right of   10
34   12  to the right of    6
35   13             near    7
36   13  to the right of    4
37   14            above   10