What is on the wall?
The air conditioner is on the wall.
    src        edge_attr  dst
0     3   to the left of    4
1     3   to the left of    9
2     3   to the left of    7
3     4   to the left of    5
4     4               on    7
5     4  to the right of    3
6     5  to the right of    4
7     5  to the right of    9
8     6   to the left of    7
9     7  to the right of    6
10    7  to the right of    3
11    9  to the right of    3
12    9   to the left of    5