What size are the windows of the trailer?
The windows are small.
   src        edge_attr  dst
0    0  to the right of    6
1    1  to the right of    4
2    4   to the left of    1
3    5  to the right of    6
4    6   to the left of    0
5    6   to the left of    5
6    6  to the right of    8
7    8   to the left of    6