What is the toilet lid made of?
The toilet lid is made of wood.
    src        edge_attr  dst
0     0   to the left of    7
1     0               of    3
2     1               of    7
3     2   to the left of   12
4     3   to the left of    7
5     3   to the left of   12
6     3             near    7
7     3               on    2
8     4               on    5
9     4           behind    7
10    4           beside   12
11    5  to the right of   12
12    7  to the right of    0
13    7  to the right of    3
14    7             near    3
15    8           behind   12
16    9           behind   12
17    9           behind    7
18   12  to the right of    2
19   12  to the right of    3
20   12   to the left of    5