What is the sign in front of?
The sign is in front of the window.
    src        edge_attr  dst
0     1   to the left of    5
1     2               on    6
2     2      in front of    8
3     3             near   10
4     3  to the right of    8
5     4               on    2
6     5  to the right of    8
7     5  to the right of    1
8     6  to the right of    7
9     7   to the left of    6
10    7           behind    8
11    8   to the left of    3
12    8           behind    2
13    8   to the left of    5
14   10             near    3
15   11               on    2