What is in front of the sky?
The skis are in front of the sky.
    src        edge_attr  dst
0     0   to the left of    5
1     0  to the right of    4
2     1      in front of    3
3     2          wearing    0
4     2          wearing   10
5     2          wearing    6
6     2   to the left of    5
7     2  to the right of    4
8     3           behind    1
9     4   to the left of    2
10    4   to the left of    0
11    4   to the left of    9
12    4   to the left of    6
13    5  to the right of   10
14    5  to the right of    2
15    5  to the right of    0
16    6  to the right of    4
17    9  to the right of    4
18   10   to the left of    5