Which device is not black, the telephone or the tablet?
The tablet is not black.
    src        edge_attr  dst
0     0   to the left of    5
1     0  to the right of   10
2     0  to the right of   12
3     0   to the left of    4
4     2  to the right of   12
5     4  to the right of   10
6     4  to the right of    0
7     4  to the right of   12
8     5  to the right of    0
9     5  to the right of   12
10    5   to the left of   11
11    6  to the right of   12
12    8  to the right of   10
13    8  to the right of   12
14    9  to the right of   12
15   10   to the left of    8
16   10   to the left of    4
17   10   to the left of    0
18   11  to the right of    5
19   11  to the right of   12
20   12   to the left of    5
21   12   to the left of   11
22   12   to the left of    2
23   12   to the left of    8
24   12   to the left of    4
25   12   to the left of    6
26   12   to the left of    0
27   12   to the left of    9