Is there either a mirror or a bus in this scene?
Yes, there is a bus.
    src        edge_attr  dst
0     1               at    6
1     1   to the left of   11
2     1   to the left of    2
3     2   to the left of   10
4     2  to the right of    9
5     2  to the right of    7
6     2   to the left of   11
7     2  to the right of    8
8     2  to the right of    1
9     3   to the left of    7
10    7   to the left of    2
11    7   to the left of   11
12    7  to the right of    3
13    8   to the left of    2
14    9   to the left of    2
15   10  to the right of    2
16   11  to the right of    2
17   11  to the right of    1
18   11  to the right of    7