What is the device on top of the table?
The device is a keyboard.
    src        edge_attr  dst
0     0        on top of   13
1     0   to the left of   10
2     1               on   15
3     2        on top of   13
4     3   to the left of    7
5     3   to the left of   11
6     3   to the left of    5
7     4   to the left of    6
8     5   to the left of   16
9     5  to the right of    3
10    5  to the right of   14
11    5   to the left of   11
12    6               on   15
13    6  to the right of   18
14    6  to the right of   16
15    6  to the right of    4
16    6  to the right of   10
17    7  to the right of   14
18    7  to the right of    3
19    7   to the left of   16
20    7   to the left of   11
21    8  to the right of   14
22    9               on    8
23    9               on   15
24    9  to the right of   14
25   10   to the left of    6
26   10  to the right of    0
27   10        on top of   13
28   11  to the right of    5
29   11   to the left of   16
30   11  to the right of    3
31   11  to the right of   14
32   11  to the right of    7
33   11        on top of   15
34   12   to the left of   17
35   12               on   15
36   14        on top of   13
37   14   to the left of   17
38   14   to the left of   11
39   14   to the left of    5
40   14   to the left of    7
41   14   to the left of    9
42   14   to the left of    8
43   14   to the left of   16
44   15          next to   17
45   15             near   17
46   16  to the right of    5
47   16  to the right of   11
48   16  to the right of   14
49   16  to the right of    7
50   16   to the left of    6
51   17  to the right of   14
52   17           beside   15
53   17             near   15
54   17  to the right of   12
55   18               on   15
56   18   to the left of    6