Does that staircase look covered?
Yes, the staircase is covered.
    src        edge_attr  dst
0     1   to the left of    3
1     1   to the left of    9
2     1   to the left of    2
3     2  to the right of   13
4     2  to the right of    1
5     3   to the left of    8
6     3  to the right of    1
7     3   to the left of   10
8     3  to the right of   13
9     3   to the left of    5
10    3   to the left of    7
11    4  to the right of    6
12    4  to the right of    7
13    4  to the right of   15
14    4  to the right of   10
15    5  to the right of   15
16    5   to the left of    7
17    5   to the left of    8
18    5  to the right of    3
19    6   to the left of    4
20    6   to the left of    7
21    6          next to   12
22    6   to the left of    8
23    6   to the left of   10
24    7  to the right of   15
25    7  to the right of    6
26    7   to the left of    8
27    7  to the right of    3
28    7  to the right of    5
29    7   to the left of    4
30    8  to the right of   10
31    8  to the right of    6
32    8  to the right of    7
33    8  to the right of    5
34    8  to the right of    3
35    8  to the right of   15
36    9  to the right of   13
37    9  to the right of    1
38   10  to the right of    6
39   10  to the right of   15
40   10   to the left of    8
41   10   to the left of    4
42   10  to the right of    3
43   11  to the right of   13
44   11  to the right of   12
45   12             near    6
46   12   to the left of   11
47   13   to the left of   11
48   13   to the left of   14
49   13   to the left of    3
50   13   to the left of    9
51   13               on   12
52   13   to the left of    2
53   14  to the right of   13
54   15   to the left of    4
55   15   to the left of    7
56   15   to the left of    5
57   15   to the left of    8
58   15   to the left of   10