The person to the left of the skis is walking on what?
The person is walking on the snow.
    src        edge_attr  dst
0     2  to the right of   12
1     2  to the right of    6
2     3  to the right of    6
3     3   to the left of   13
4     5  to the right of   17
5     5  to the right of   20
6     6   to the left of    2
7     6   to the left of    9
8     6   to the left of    3
9     6               on    7
10    6  to the right of   12
11    6       walking on   12
12    7  to the right of   21
13    7  to the right of   16
14    7  to the right of    8
15    7  to the right of   19
16    7  to the right of   10
17    8   to the left of    7
18    8   to the left of   10
19    8   to the left of   11
20    9  to the right of   12
21    9          holding    2
22    9          wearing    2
23    9  to the right of    6
24   10   to the left of   12
25   10   to the left of   11
26   10  to the right of    8
27   10   to the left of    7
28   11  to the right of   16
29   11   to the left of   12
30   11  to the right of   10
31   11  to the right of    8
32   12  to the right of   10
33   12  to the right of   11
34   12   to the left of    2
35   12   to the left of    9
36   12  to the right of   16
37   12  to the right of   21
38   12   to the left of    6
39   12               on    8
40   13  to the right of    3
41   14  to the right of   16
42   14  to the right of   21
43   16   to the left of    7
44   16   to the left of   14
45   16   to the left of   12
46   16   to the left of   11
47   16          wearing   19
48   16          wearing   21
49   16      standing in   12
50   17   to the left of    5
51   17  to the right of   20
52   19   to the left of    7
53   20   to the left of    5
54   20   to the left of   17
55   21   to the left of   14
56   21   to the left of   12
57   21   to the left of    7