What is that girl in front of?
The girl is in front of the wall.
    src        edge_attr  dst
0     0  to the right of   15
1     1  to the right of   15
2     2               on   16
3     5       hanging on   12
4    10           behind   18
5    10  to the right of   15
6    11  to the right of   15
7    12  to the right of   15
8    13  to the right of   15
9    14  to the right of   15
10   15   to the left of    0
11   15   to the left of   14
12   15   to the left of   13
13   15   to the left of   10
14   15   to the left of   12
15   15   to the left of    1
16   15   to the left of   20
17   15   to the left of   11
18   18          holding   17
19   18       sitting on    3
20   18      in front of   10
21   20               of   18
22   20  to the right of   15