What is the color of the trash can made of metal?
The trash can is silver.
    src        edge_attr  dst
0     0               on   10
1     1       sitting on    9
2     1               on   10
3     1  to the right of    3
4     2               on   10
5     2       sitting on    9
6     3   to the left of    1
7     4   to the left of    8
8     4      in front of    5
9     4   to the left of    6
10    5   to the left of    8
11    5   to the left of    6
12    5           behind    4
13    6  to the right of    4
14    6  to the right of    5
15    8  to the right of    5
16    8  to the right of    4