What color does the long shelf have?
The shelf has white color.
    src        edge_attr  dst
0     0               in    1
1     0  to the right of    3
2     2   to the left of    9
3     2   to the left of    6
4     3   to the left of    0
5     4   to the left of    6
6     6  to the right of    9
7     6  to the right of    2
8     6  to the right of    4
9     9  to the right of    2
10    9   to the left of    6