What kind of device is gray?
The device is a keyboard.
    src        edge_attr  dst
0     2            under    9
1     2            below    9
2     3           behind   10
3     3           behind    8
4     6             near   10
5     8               on    7
6     8      in front of   10
7     8      in front of    3
8     9            above    2
9    10               on    7
10   10             near    6
11   10   to the left of   11
12   10           behind    8
13   10      in front of    3
14   11  to the right of   10