What device is above the book?
The device is a monitor.
    src        edge_attr  dst
0     0               on    6
1     1   to the left of    3
2     1               on    9
3     1  to the right of    4
4     2  to the right of    5
5     2  to the right of    4
6     2  to the right of    7
7     2  to the right of   11
8     3               on    9
9     3  to the right of    1
10    4   to the left of   11
11    4   to the left of    7
12    4   to the left of    2
13    4   to the left of    5
14    4   to the left of    1
15    5   to the left of    2
16    5  to the right of    4
17    5               on    9
18    6   to the left of   12
19    7  to the right of    4
20    7   to the left of    2
21    8            above    9
22    8            above   11
23    8   to the left of   12
24    9            below    8
25   11  to the right of    4
26   11   to the left of    2
27   11            under    8
28   12               on    6
29   12  to the right of    8
30   12  to the right of    6