How thick are the tall trees?
The trees are thin.
    src        edge_attr  dst
0     1             near    3
1     1  to the right of    6
2     1  to the right of    3
3     1  to the right of    2
4     1  to the right of    5
5     1  to the right of    4
6     2   to the left of    1
7     3             near    1
8     3               on    2
9     3   to the left of    1
10    4   to the left of    1
11    5   to the left of    1
12    6   to the left of    1
13    6               on    3