What is the material of the door?
The door is made of wood.
   src        edge_attr  dst
0    4  to the right of    9
1    6  to the right of    9
2    9   to the left of    4
3    9   to the left of   15
4    9   to the left of    6
5   12         lying in    2
6   12               on    2
7   12         lying on    2
8   15  to the right of    9