What is the color of the helmet in the middle of the image?
The helmet is gray.
    src        edge_attr  dst
0     0               in    7
1     1               on   10
2     2            above    4
3     3               in    2
4     5               on    6
5     5   to the left of    8
6     5   to the left of   15
7     5   to the left of   13
8     8               at    7
9     8  to the right of    5
10    9               of    8
11   10               of    8
12   13  to the right of   15
13   13  to the right of    5
14   14  to the right of   15
15   14               on   13
16   15  to the right of    5
17   15   to the left of   14
18   15   to the left of   13
19   16               on   15