Which kind of device is behind the sign?
The device is a computer.
    src        edge_attr  dst
0     0   to the left of    1
1     0           behind    5
2     0   to the left of   12
3     0  to the right of    5
4     0               on    8
5     1  to the right of   11
6     1  to the right of    7
7     1  to the right of    0
8     1  to the right of    4
9     2  to the right of    4
10    4           behind    8
11    4   to the left of   12
12    4   to the left of    2
13    4   to the left of    1
14    5      in front of    0
15    5   to the left of    0
16    5   to the left of    7
17    6  to the right of   10
18    6       sitting at    8
19    6  to the right of    7
20    7   to the left of    6
21    7  to the right of    5
22    7   to the left of   12
23    7   to the left of    1
24    7               on    8
25    8      in front of    4
26    9   to the left of   10
27   10   to the left of    6
28   10               on    8
29   10  to the right of    9
30   11   to the left of    1
31   12  to the right of    4
32   12  to the right of    7
33   12  to the right of    0