What is on the ski?
The snow is on the ski.
    src        edge_attr  dst
0     0  to the right of   17
1     0  to the right of    6
2     0  to the right of   16
3     0  to the right of   13
4     0   to the left of   18
5     0             with    7
6     0             with   11
7     1               on   15
8     3  to the right of   13
9     3  to the right of    5
10    4               on   10
11    4  to the right of   13
12    5  to the right of   16
13    5   to the left of    3
14    5   to the left of   14
15    6  to the right of    8
16    6   to the left of    0
17    6   to the left of   17
18    7   to the left of   18
19    7  to the right of   17
20    8   to the left of    6
21    9  to the right of   16
22   11  to the right of   16
23   13   to the left of    4
24   13               on   10
25   13   to the left of    0
26   13   to the left of    3
27   13   to the left of   14
28   14  to the right of   13
29   14  to the right of   16
30   14  to the right of    5
31   16   to the left of    9
32   16   to the left of   14
33   16   to the left of    0
34   16   to the left of   11
35   16   to the left of    5
36   17  to the right of    6
37   17   to the left of    7
38   17   to the left of    0
39   18               on    2
40   18  to the right of    0
41   18  to the right of    7