What is under the windows?
The boxes are under the windows.
    src        edge_attr  dst
0     1  to the right of   11
1     1  to the right of    5
2     1  to the right of   13
3     1   to the left of    9
4     1   to the left of    7
5     3            below   10
6     3            under   10
7     3   to the left of    8
8     3   to the left of    9
9     3  to the right of   12
10    3  to the right of   13
11    3               on    2
12    4               on    2
13    4  to the right of   13
14    4  to the right of   12
15    4   to the left of    9
16    4      in front of    8
17    5               on    2
18    5   to the left of    1
19    7  to the right of    1
20    8  to the right of   12
21    8  to the right of   13
22    8  to the right of    3
23    8   to the left of    9
24    8           behind    4
25    9  to the right of    4
26    9  to the right of    8
27    9  to the right of    1
28    9  to the right of    3
29   10  to the right of   13
30   10            above    3
31   11   to the left of   12
32   11   to the left of    1
33   12   to the left of    4
34   12   to the left of    8
35   12   to the left of    3
36   12  to the right of   11
37   13   to the left of    3
38   13   to the left of    4
39   13   to the left of    8
40   13   to the left of   10
41   13   to the left of    1