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