Which kind of device is to the left of the gadget?
The device is a camera.
    src        edge_attr  dst
0     0   to the left of    4
1     1  to the right of    8
2     1               on    5
3     1   to the left of    2
4     2  to the right of    1
5     3               on    5
6     4               on    5
7     4  to the right of    0
8     4  to the right of    7
9     7               on    5
10    7   to the left of    4
11    8   to the left of    1