What is before the bush?
The wall is in front of the shrub.
    src        edge_attr  dst
0     1           behind    3
1     1      in front of    7
2     2  to the right of    5
3     2           behind    3
4     2  to the right of    3
5     3      in front of    1
6     3   to the left of    2
7     3   to the left of    8
8     3      in front of    2
9     4  to the right of   10
10    5   to the left of    2
11    7           behind    1
12    8  to the right of    3
13   10   to the left of    4