Which device is not black, the keyboard or the telephone?
The keyboard is not black.
    src        edge_attr  dst
0     2   to the left of   12
1     2  to the right of    4
2     2   to the left of    8
3     2  to the right of    5
4     3   to the left of   12
5     4   to the left of    2
6     5   to the left of    9
7     5   to the left of    2
8     6   to the left of   13
9     7          holding    2
10    7   to the left of    8
11    7   to the left of   12
12    8  to the right of    7
13    8  to the right of    2
14    8  to the right of    9
15    9   to the left of   12
16    9  to the right of    5
17    9   to the left of    8
18   11         lying on    0
19   12               on   10
20   12  to the right of    9
21   12  to the right of    7
22   12  to the right of    3
23   12  to the right of    2
24   13  to the right of    6