What device is on the counter?
The device is a monitor.
    src        edge_attr  dst
0     4  to the right of    6
1     4  to the right of   12
2     5   to the left of    8
3     5   to the left of    7
4     6               on   11
5     6   to the left of    4
6     7  to the right of    9
7     7  to the right of    5
8     8  to the right of    5
9     8  to the right of    9
10    9               on    0
11    9   to the left of    7
12    9   to the left of    8
13   10               on    0
14   12   to the left of    4