What device is not black?
The device is a screen.
    src        edge_attr  dst
0     0  to the right of    5
1     0  to the right of    3
2     0  to the right of    7
3     1  to the right of    3
4     1               at    0
5     1  to the right of    7
6     1  to the right of    5
7     1   to the left of    8
8     2               on    4
9     2  to the right of    5
10    2  to the right of    3
11    2  to the right of    7
12    3   to the left of    1
13    3   to the left of    0
14    3   to the left of    6
15    3   to the left of    2
16    3   to the left of    4
17    4   to the left of    9
18    4  to the right of    3
19    4  to the right of    5
20    4  to the right of    7
21    5   to the left of    2
22    5   to the left of    1
23    5   to the left of    0
24    5   to the left of    6
25    5   to the left of    4
26    5               on   11
27    6  to the right of   11
28    6  to the right of    7
29    6  to the right of    5
30    6  to the right of    3
31    7   to the left of    1
32    7   to the left of    2
33    7   to the left of    0
34    7   to the left of    4
35    7   to the left of    6
36    8  to the right of   11
37    8  to the right of    1
38    9               on    3
39    9  to the right of    4
40   11   to the left of    6
41   11   to the left of    8