Which material is the window made of?
The window is made of glass.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of    6
2     0               of   13
3     1               of   13
4     2               of   13
5     2   to the left of    5
6     2   to the left of    6
7     3               of   13
8     3   to the left of    7
9     4               of   13
10    4   to the left of    6
11    5  to the right of    2
12    5               of   13
13    5   to the left of    6
14    6  to the right of    4
15    6  to the right of    5
16    6  to the right of    7
17    6  to the right of    8
18    6  to the right of   10
19    6  to the right of   12
20    6  to the right of   13
21    6  to the right of    2
22    6  to the right of    0
23    7               of   13
24    7  to the right of    3
25    7   to the left of    6
26    8   to the left of    6
27   10   to the left of    6
28   10           behind   13
29   12   to the left of    6
30   12  to the right of    0
31   13      in front of   10
32   13   to the left of    6