What is the snow covering?
The snow is covering the mountain.
    src        edge_attr  dst
0     2   to the left of    9
1     2   to the left of    8
2     2   to the left of   14
3     4  to the right of    9
4     4  to the right of    8
5     5   to the left of    9
6     5   to the left of   14
7     7   to the left of   14
8     7   to the left of    9
9     7   to the left of    8
10    8  to the right of    2
11    8  to the right of    7
12    8   to the left of    4
13    8  to the right of    9
14    9             near   15
15    9   to the left of   14
16    9  to the right of    5
17    9   to the left of    4
18    9  to the right of    2
19    9   to the left of    8
20    9  to the right of    7
21   10  to the right of   15
22   11               on   15
23   11         covering   15
24   12  to the right of   15
25   13               on   14
26   14  to the right of    5
27   14  to the right of    9
28   14  to the right of    7
29   14  to the right of    2
30   15             near    9
31   15   to the left of   10
32   15   to the left of   12
33   15       covered by   11