Who is sitting?
The people are sitting.
   src        edge_attr  dst
0    1   to the left of    9
1    2            below    7
2    2           behind    4
3    4      in front of    7
4    4      in front of    2
5    7          wearing    0
6    7           behind    4
7    7               on    6
8    9  to the right of    1