What are the doors made of?
The doors are made of glass.
    src        edge_attr  dst
0     0  to the right of    9
1     0  to the right of   11
2     1               in    2
3     1            below    3
4     1  to the right of    9
5     3            above    1
6     3     hanging over    1
7     3  to the right of   10
8     3  to the right of    9
9     3               on    5
10    4   to the left of   10
11    4   to the left of   11
12    4   to the left of    5
13    5  to the right of    9
14    5  to the right of   12
15    5  to the right of    4
16    6               on    1
17    6  to the right of    9
18    6   on the side of    1
19    7   to the left of    9
20    7   to the left of   12
21    8               in    2
22    8   to the left of    9
23    8   to the left of   12
24    9  to the right of    8
25    9  to the right of    7
26    9   to the left of    0
27    9   to the left of   10
28    9   to the left of   11
29    9   to the left of    6
30    9   to the left of    3
31    9   to the left of    1
32    9   to the left of    5
33    9               in    2
34   10   to the left of    3
35   10  to the right of    4
36   10               in    2
37   10  to the right of    9
38   11  to the right of    9
39   11  to the right of    4
40   11   to the left of    0
41   11  to the right of   12
42   11               in    2
43   12   to the left of   11
44   12   to the left of    5
45   12  to the right of    7
46   12  to the right of    8