Which kind of device is to the left of the laptop?
The devices are controllers.
    src        edge_attr  dst
0     0               on    3
1     0  to the right of    2
2     0   to the left of    8
3     1  to the right of    5
4     2   to the left of    0
5     2               on    3
6     4  to the right of    7
7     5               on    1
8     5   to the left of    1
9     6               on    4
10    6   to the left of    8
11    7               on    3
12    7   to the left of    4
13    7   to the left of    8
14    8               on    4
15    8  to the right of    6
16    8  to the right of    0
17    8  to the right of    7