Are there letters or lamps that are white?
Yes, the letters are white.
    src        edge_attr  dst
0     0   to the left of    2
1     0               of    4
2     2  to the right of    4
3     2  to the right of    0
4     3  to the right of    4
5     4   to the left of    3
6     4   to the left of    5
7     4           beside    3
8     4   to the left of    2
9     4            below    7
10    5  to the right of    4
11    7               on    2
12    7            above    4