Are there any windows?
Yes, there is a window.
    src        edge_attr  dst
0     0               on    2
1     1  to the right of   11
2     1   to the left of   15
3     1  to the right of    9
4     3  to the right of   15
5     4  to the right of   20
6     4  to the right of    9
7     4   to the left of   18
8     4  to the right of    8
9     4  to the right of   17
10    5               on    0
11    5   to the left of   15
12    5  to the right of   16
13    5  to the right of    9
14    7               of    0
15    8   to the left of    4
16    8   to the left of   17
17    8   to the left of   20
18    9   to the left of    1
19    9   to the left of   18
20    9   to the left of    4
21    9   to the left of   16
22    9   to the left of    5
23    9   to the left of   11
24   10   to the left of   19
25   11  to the right of    9
26   11   to the left of   18
27   11   to the left of   15
28   11   to the left of    1
29   15  to the right of   16
30   15  to the right of   18
31   15  to the right of    1
32   15   to the left of    3
33   15  to the right of   11
34   15  to the right of    5
35   16   to the left of    5
36   16               on    0
37   16  to the right of    9
38   16   to the left of   15
39   17   to the left of    4
40   17   to the left of   20
41   17  to the right of    8
42   18  to the right of   20
43   18   to the left of   15
44   18  to the right of    9
45   18  to the right of    4
46   18  to the right of   11
47   19  to the right of   10
48   19               of    0
49   20   to the left of    4
50   20  to the right of   17
51   20  to the right of    8
52   20   to the left of   18