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