What is the building in front of?
The building is in front of the window.
    src        edge_attr  dst
0     2      in front of    3
1     3   to the left of    4
2     3   to the left of    6
3     4   to the left of    6
4     4  to the right of    3
5     4   to the left of    5
6     5  to the right of    4
7     6  to the right of    3
8     6  to the right of    4
9     6  to the right of    7
10    7               on    4
11    7   to the left of    6