What is the wall surrounding?
The wall is surrounding the window.
    src        edge_attr  dst
0     0  to the right of    8
1     2    surrounded by    5
2     2  to the right of    6
3     3  to the right of    9
4     4  to the right of    9
5     5      surrounding    2
6     6   to the left of    2
7     6   to the left of    9
8     6   to the left of   11
9     7  to the right of   11
10    7               in    2
11    8   to the left of    0
12    9   to the left of    3
13    9   to the left of    4
14    9  to the right of    6
15   11  to the right of    6
16   11   to the left of    7