Do you see both cars and windows there?
No, there is a window but no cars.
     src        edge_attr  dst
0      0           behind   31
1      0             near   31
2      1  to the right of   24
3      1   to the left of   29
4      1  to the right of   12
..   ...              ...  ...
122   30  to the right of   18
123   30   to the left of   28
124   30   to the left of   25
125   30   to the left of   29
126   31             near    0

[127 rows x 3 columns]