What is the coffee table made of?
The coffee table is made of glass.
    src        edge_attr  dst
0     0   to the left of    6
1     0   to the left of    5
2     0   to the left of   12
3     1  to the right of   14
4     1  to the right of    4
5     2   to the left of    7
6     2               on   14
7     4   to the left of    1
8     4   to the left of   11
9     5  to the right of    0
10    5   to the left of    8
11    5   to the left of   12
12    5   to the left of   13
13    6   to the left of    8
14    6  to the right of    0
15    7  to the right of   13
16    7            below    9
17    7  to the right of    2
18    7  to the right of    8
19    7            under    9
20    7               on   10
21    8  to the right of    5
22    8  to the right of    6
23    8               on   10
24    8   to the left of    7
25    8   to the left of   13
26    9            above    7
27   10   to the left of   11
28   11  to the right of   10
29   11  to the right of    4
30   12  to the right of    0
31   12  to the right of    5
32   13               on   10
33   13   to the left of    7
34   13  to the right of    5
35   13  to the right of    8
36   14   to the left of    1