Is the lamp white or black?
The lamp is black.
    src        edge_attr  dst
0     0  to the right of   12
1     0   to the left of    5
2     0  to the right of    9
3     1   to the left of   10
4     1   to the left of    6
5     1   to the left of   13
6     1   to the left of   11
7     2               on    4
8     3   to the left of    8
9     3   to the left of   12
10    3   to the left of   10
11    5  to the right of    9
12    5  to the right of    0
13    6  to the right of    1
14    8  to the right of    3
15    8               on   12
16    9   to the left of    5
17    9   to the left of    0
18   10  to the right of    1
19   10  to the right of    3
20   11  to the right of    1
21   12   to the left of    0
22   12  to the right of    3
23   12             with   13
24   13  to the right of    1
25   13               on   10