What is on the open window?
The sign is on the window.
    src        edge_attr  dst
0     2   to the left of    3
1     2  to the right of   14
2     2   to the left of    6
3     2   to the left of    9
4     3  to the right of   14
5     3  to the right of    5
6     3  to the right of    2
7     4   to the left of   10
8     5   to the left of    9
9     5  to the right of   14
10    5   to the left of    3
11    6  to the right of    2
12    7               on    0
13    9  to the right of    2
14    9  to the right of   14
15    9  to the right of    5
16   10  to the right of   12
17   10               on    8
18   10  to the right of    4
19   12   to the left of   10
20   14   to the left of    9
21   14   to the left of    5
22   14   to the left of    3
23   14   to the left of    2