The dark door is made of what material?
The door is made of wood.
   src        edge_attr  dst
0    0   to the left of    5
1    0   to the left of    3
2    0   to the left of    2
3    0   to the left of    4
4    2  to the right of    0
5    3  to the right of    0
6    4  to the right of    0
7    5  to the right of    0