Which color are the buildings that are not unlit?
The buildings are dark.
    src        edge_attr  dst
0     0  to the right of    5
1     0  to the right of    1
2     0  to the right of   11
3     1               on    3
4     1   to the left of    0
..  ...              ...  ...
61   15   to the left of    2
62   15  to the right of   14
63   15   to the left of    4
64   15  to the right of    9
65   16  to the right of   11

[66 rows x 3 columns]