Which kind of device is black?
The device is a keyboard.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of    5
2     0   to the left of    1
3     0   to the left of    7
4     1  to the right of    4
5     1  to the right of    0
6     1  to the right of    3
7     2  to the right of    0
8     3   to the left of    7
9     3   to the left of    1
10    4           inside    0
11    4   to the left of    1
12    4   to the left of    7
13    5  to the right of    0
14    7  to the right of    4
15    7  to the right of    0
16    7  to the right of    3