What does the snow cover?
The snow covers the mountain.
    src        edge_attr  dst
0     0   to the left of   13
1     0  to the right of    7
2     0  to the right of    4
3     0  to the right of   10
4     0   to the left of    9
5     1  to the right of    2
6     2  to the right of    6
7     2   to the left of    1
8     2   to the left of   13
9     2   to the left of    8
10    2       covered by    3
11    3         covering    2
12    4   to the left of    0
13    4          wearing    5
14    4   to the left of    8
15    4   to the left of    7
16    4   to the left of   10
17    4   to the left of   13
18    5   to the left of    8
19    5   to the left of   13
20    5   to the left of   10
21    6   to the left of    2
22    7   to the left of   13
23    7   to the left of    9
24    7  to the right of    4
25    7   to the left of    0
26    8  to the right of   10
27    8  to the right of    5
28    8  to the right of    4
29    8  to the right of    2
30    9  to the right of   11
31    9               of   13
32    9  to the right of    0
33    9  to the right of    7
34   10   to the left of   13
35   10   to the left of    0
36   10  to the right of    4
37   10  to the right of    5
38   10   to the left of    8
39   11  to the right of   14
40   11   to the left of    9
41   11   to the left of   13
42   11          wearing   10
43   13  to the right of   11
44   13  to the right of    0
45   13  to the right of   10
46   13  to the right of    7
47   13  to the right of    2
48   13  to the right of    4
49   13  to the right of    5
50   13          wearing    1
51   13               on   12
52   14   to the left of   11