Which kind of device is not gray?
The device is a computer mouse.
    src        edge_attr  dst
0     0               on   14
1     0      in front of    5
2     1               on    3
3     2   to the left of   10
4     2     plugged into    5
5     2     hanging from    5
6     4               on    7
7     5           behind    0
8     5   to the left of   18
9     5   to the left of   13
10    5  to the right of    7
11    5  to the right of   17
12    5   to the left of   11
13    6               on   14
14    6  to the right of   11
15    7   to the left of    5
16    7   to the left of   16
17    8   to the left of   11
18    8  to the right of   10
19   10  to the right of   17
20   10   to the left of   11
21   10   to the left of    8
22   10  to the right of    2
23   11               on   14
24   11  to the right of    5
25   11   to the left of    6
26   11  to the right of    8
27   11  to the right of   12
28   11  to the right of   10
29   11  to the right of   15
30   11  to the right of   16
31   12   to the left of   18
32   12  to the right of   16
33   12   to the left of   11
34   12   to the left of   13
35   13  to the right of    5
36   13  to the right of   12
37   15   to the left of   11
38   16   to the left of   12
39   16   to the left of   18
40   16  to the right of    7
41   16   to the left of   11
42   17   to the left of    5
43   17               on   14
44   17   to the left of   10
45   18               of   11
46   18  to the right of   12
47   18  to the right of   16
48   18  to the right of    5