Do you see helmets or skis in the picture?
Yes, there is a helmet.
    src        edge_attr  dst
0     0   to the left of   12
1     0  to the right of    4
2     1   to the left of   12
3     1   to the left of   11
4     4   to the left of    0
5     4   to the left of   11
6     4   to the left of    7
7     7  to the right of    4
8     7   to the left of   12
9     8   to the left of   11
10    8   to the left of   12
11   10   to the left of   11
12   11  to the right of   10
13   11  to the right of    4
14   11  to the right of    1
15   11  to the right of    8
16   12  to the right of    0
17   12  to the right of    7
18   12  to the right of    1
19   12  to the right of    8