What kind of device isn't black?
The device is a screen.
    src        edge_attr  dst
0     0               on    6
1     0  to the right of    5
2     0  to the right of    3
3     1  to the right of    5
4     2  to the right of    5
5     3   to the left of    0
6     3   to the left of   11
7     4  to the right of    9
8     4  to the right of   12
9     5  to the right of   13
10    5   to the left of    2
11    5   to the left of    1
12    5   to the left of    0
13    8  to the right of    9
14    9   to the left of    8
15    9   to the left of   10
16    9   to the left of    4
17    9   to the left of   12
18   10  to the right of    9
19   10  to the right of   12
20   10          holding    8
21   11  to the right of    3
22   12  to the right of    9
23   12   to the left of   10
24   12   to the left of    4
25   13   to the left of    5