What is the device that is on top of the device on the fan?
The device is a computer mouse.
    src        edge_attr  dst
0     1   to the left of    3
1     1   to the left of    6
2     2        on top of    9
3     3  to the right of    1
4     6  to the right of    1
5     7               on    4
6     9               on    6
7     9               on    0
8     9  to the right of   10
9    10   to the left of    9
10   10               on    0