Which color is the empty bench?
The bench is brown.
    src        edge_attr  dst
0     0   to the left of    6
1     3               in    2
2     3               on    2
3     3   to the left of    4
4     3   to the left of    8
5     4  to the right of    3
6     6  to the right of    8
7     6  to the right of    0
8     6               in    2
9     8   to the left of    6
10    8  to the right of    3