How hard is the white snow?
The snow is hard.
    src        edge_attr  dst
0     0  to the right of    6
1     0               of   12
2     1   to the left of    2
3     1   to the left of    4
4     2  to the right of   13
5     2   to the left of    4
6     2               of   12
7     2  to the right of    1
8     3   to the left of    4
9     3               of   12
10    4           behind   12
11    4  to the right of    1
12    4  to the right of   10
13    4  to the right of    7
14    4  to the right of   13
15    4  to the right of   12
16    4  to the right of    3
17    4  to the right of    2
18    6   to the left of   13
19    6   to the left of    0
20    6   to the left of   14
21    7   to the left of    4
22   10   to the left of    4
23   11            below   12
24   12   to the left of    4
25   12      in front of    4
26   12            above   11
27   13   to the left of    2
28   13   to the left of    4
29   13  to the right of    6
30   14  to the right of    6