What is the monitor on?
The monitor is on the wall.
    src        edge_attr  dst
0     0  to the right of   12
1     0  to the right of   10
2     0  to the right of   13
3     0   to the left of    8
4     0  to the right of    1
5     1               on    7
6     1   to the left of    0
7     1   to the left of    8
8     3       sitting on    4
9     3   to the left of    5
10    3   to the left of    8
11    5  to the right of    3
12    6               on    9
13    6  to the right of   11
14    6   to the left of    8
15    7  to the right of   13
16    7  to the right of   10
17    7  to the right of   12
18    8  to the right of   11
19    8  to the right of   13
20    8  to the right of   12
21    8  to the right of    3
22    8  to the right of    1
23    8  to the right of    0
24    8  to the right of   10
25    8  to the right of    9
26    8  to the right of    6
27    9   to the left of    8
28   10   to the left of    7
29   10   to the left of    8
30   10   to the left of    0
31   11   to the left of    8
32   11   to the left of    6
33   12       sitting on   13
34   12   to the left of    7
35   12   to the left of    0
36   12   to the left of    8
37   13   to the left of    0
38   13   to the left of    8
39   13   to the left of    7