Is the snow empty and white?
No, the snow is white but full.
    src        edge_attr  dst
0     0   to the left of    3
1     0   to the left of    6
2     2  to the right of   14
3     2  to the right of   13
4     2   to the left of   11
5     2  to the right of    7
6     3  to the right of    7
7     3  to the right of    0
8     3  to the right of   14
9     3  to the right of   13
10    4   to the left of   15
11    4   to the left of   13
12    6  to the right of    0
13    6  to the right of   14
14    6  to the right of   13
15    6  to the right of    7
16    7   to the left of    6
17    7   to the left of    2
18    7   to the left of   13
19    7   to the left of    3
20    8   to the left of   11
21   11  to the right of    8
22   11  to the right of    2
23   11  to the right of   13
24   11  to the right of   15
25   11  to the right of   14
26   13   to the left of    3
27   13  to the right of    4
28   13   to the left of   11
29   13   to the left of    2
30   13  to the right of    7
31   13   to the left of    6
32   14   to the left of    3
33   14   to the left of    6
34   14   to the left of   11
35   14   to the left of    2
36   14          holding   13
37   15   to the left of   11
38   15  to the right of    4