What device is to the left of the box?
The device is a speaker.
    src        edge_attr  dst
0     0  to the right of    3
1     1  to the right of    5
2     1  to the right of    3
3     1  to the right of    8
4     2   to the left of    7
5     3   to the left of    1
6     3   to the left of    0
7     4  to the right of    6
8     5   to the left of    1
9     6   to the left of    4
10    7  to the right of    2
11    8               on    0
12    8   to the left of    1