What's the lid made of?
The lid is made of glass.
    src        edge_attr  dst
0     0   to the left of   16
1     1  to the right of   17
2     2  to the right of   17
3     3  to the right of   16
4     3   to the left of   11
5     5   to the left of   11
6     6  to the right of   17
7     6   to the left of    7
8     7  to the right of   17
9     7  to the right of    6
10    8  to the right of   17
11    9  to the right of   17
12   10   to the left of   13
13   10   to the left of   12
14   11  to the right of    5
15   11  to the right of    3
16   12  to the right of   10
17   13  to the right of   10
18   15               of   14
19   16  to the right of    0
20   16   to the left of    3
21   17   to the left of    8
22   17   to the left of    9
23   17   to the left of    1
24   17   to the left of    2
25   17   to the left of    6
26   17   to the left of    7