Who is on the mound?
The man is on the mound.
    src        edge_attr  dst
0     0           behind   17
1     4  on the front of    6
2     8          wearing    2
3     8          wearing    3
4     8          wearing   10
5     8      standing in   12
6     8               on   20
7    15               on   12
8    16          wearing    6
9    16          wearing   13
10   17      in front of    0
11   18       growing on   12
12   19               on   12