What type of device is not gray?
The device is a monitor.
    src        edge_attr  dst
0     1   to the left of    2
1     1               of    5
2     2  to the right of    1
3     4           behind    5
4     5       looking at    8
5     5          wearing    3
6     5      in front of    4
7     5             near    8
8     7   to the left of   10
9     8             near    5
10    9               of    5
11   10               on    5
12   10  to the right of    7
13   11               of    5
14   13               on    5