Do you see trains or windows?
Yes, there is a window.
    src        edge_attr  dst
0     1   to the left of   10
1     1   to the left of    3
2     1   to the left of    8
3     3  to the right of    1
4     4  to the right of    7
5     5               on    5
6     6  to the right of    7
7     7   to the left of    6
8     7   to the left of    4
9     8  to the right of    1
10   10  to the right of    1
11   10   to the left of   11
12   11               in    3
13   11  to the right of   10
14   12       walking on   12