Are there any doors?
Yes, there are doors.
    src        edge_attr  dst
0     0   to the left of   14
1     1               by   10
2     2   to the left of   12
3     2   to the left of   11
4     4   to the left of    9
5     5  to the right of   17
6     5   to the left of   12
7     6  to the right of   14
8     6   to the left of   11
9     7   to the left of   12
10    7  to the right of    8
11    7  to the right of   17
12    8   to the left of    7
13    8   to the left of   12
14    9  to the right of   16
15    9  to the right of    4
16   11  to the right of   13
17   11  to the right of   18
18   11  to the right of    6
19   11  to the right of   15
20   11  to the right of    2
21   11               on   10
22   12  to the right of   17
23   12  to the right of    2
24   12  to the right of   18
25   12  to the right of    7
26   12  to the right of    5
27   12  to the right of    8
28   13  to the right of   14
29   13   to the left of   11
30   14   to the left of    6
31   14  to the right of    0
32   14   to the left of   13
33   15   to the left of   11
34   16   to the left of    9
35   17   to the left of    5
36   17   to the left of    7
37   17   to the left of   12
38   18   to the left of   12
39   18   to the left of   11