What device is on, the monitor or the telephone?
The monitor is on.
    src        edge_attr  dst
0     0  to the right of    1
1     1   to the left of    6
2     1  to the right of    2
3     1       sitting on    4
4     1   to the left of    0
5     1               on    4
6     2   to the left of    5
7     2               on    4
8     2   to the left of    1
9     5  to the right of    2
10    5               on    4
11    5   to the left of    6
12    6               on    4
13    6  to the right of    5
14    6  to the right of    1
15    7   to the left of    9
16    8               on    4
17    8  to the right of   11
18    9     hanging from    4
19    9  to the right of    7
20   11   to the left of    8
21   11               on    4