Are there speakers or computers that are not black?
No, there is a computer but it is black.
   src        edge_attr  dst
0    1   to the left of    5
1    4  to the right of    8
2    5  to the right of    1
3    7  to the right of    8
4    8   to the left of    7
5    8   to the left of    9
6    8   to the left of    4
7    9  to the right of    8