Is the tray below the cake made of wood or cardboard?
The tray is made of cardboard.
    src        edge_attr  dst
0     0  to the right of    7
1     0  to the right of    6
2     1  to the right of    8
3     1  to the right of    4
4     2  to the right of    6
5     2  to the right of    7
6     3            under    5
7     3            below    5
8     4   to the left of    5
9     4   to the left of    7
10    4   to the left of    1
11    4   to the left of    6
12    5  to the right of    8
13    5            above    3
14    5  to the right of    4
15    6  to the right of    8
16    6               on    5
17    6  to the right of    4
18    6   to the left of    0
19    6   to the left of    2
20    7  to the right of    8
21    7   to the left of    2
22    7               of    6
23    7   to the left of    0
24    7  to the right of    4
25    8   to the left of    9
26    8   to the left of    1
27    8   to the left of    6
28    8   to the left of    5
29    8   to the left of    7
30    9  to the right of    8