What is in the window?
The tree is in the window.
    src        edge_attr  dst
0     0               in    9
1     0          next to    3
2     0             near    3
3     1  to the right of    7
4     1  to the right of    4
5     1  to the right of    8
6     2   to the left of    7
7     3  to the right of    9
8     3      in front of    6
9     3             near    6
10    3             near    0
11    4   to the left of    1
12    4               on    7
13    6             near    3
14    6               in    5
15    6           behind    3
16    7  to the right of    2
17    7   to the left of    1
18    8   to the left of    1
19    8               on    7
20    9   to the left of    3