What is covered in snow?
The roof is covered in snow.
    src        edge_attr  dst
0     0       covered in    9
1     0  to the right of    2
2     0  to the right of    8
3     1  to the right of   11
4     1  to the right of    7
5     1               of    8
6     2   to the left of    0
7     4   to the left of    5
8     4   to the left of   12
9     5   to the left of   12
10    5  to the right of    4
11    6           behind   12
12    7  to the right of   14
13    7           behind   12
14    7   to the left of    1
15    7   to the left of   16
16    7      in front of   14
17    7   to the left of   15
18    7   to the left of    8
19    7   to the left of   13
20    7   to the left of   12
21    8  to the right of    7
22    8  to the right of   14
23    8               on   12
24    8   to the left of    0
25    8  to the right of   11
26    9               on   13
27    9               on    3
28   11   to the left of   13
29   11   to the left of   12
30   11   to the left of    8
31   11   to the left of    1
32   12      in front of    7
33   12      in front of    6
34   12  to the right of    4
35   12  to the right of   11
36   12  to the right of    5
37   12  to the right of    7
38   12  to the right of   14
39   13  to the right of   14
40   13  to the right of    7
41   13  to the right of   11
42   14           behind    7
43   14   to the left of   16
44   14   to the left of   13
45   14   to the left of    8
46   14   to the left of    7
47   14   to the left of   12
48   15  to the right of    7
49   16  to the right of    7
50   16  to the right of   14