What is on the mound?
The snow is on the mound.
    src        edge_attr  dst
0     2   to the left of    9
1     2   to the left of    8
2     4               on    0
3     5   to the left of    8
4     5          wearing    2
5     5   to the left of    9
6     8  to the right of    2
7     8  to the right of    5
8     8          wearing    9
9     9  to the right of    2
10    9  to the right of    5