What's the bench made of?
The bench is made of metal.
    src        edge_attr  dst
0     0           behind   12
1     1   to the left of    8
2     1               on    4
3     1  to the right of    3
4     2   to the left of    9
5     2   to the left of    7
6     2  to the right of    3
7     2   to the left of   13
8     3   to the left of   15
9     3   to the left of    7
10    3   to the left of    2
11    3   to the left of    1
12    3   to the left of    8
13    3   to the left of    9
14    3  to the right of   14
15    3  to the right of    6
16    5  to the right of   12
17    5  to the right of    9
18    5  to the right of   13
19    5  to the right of    7
20    6   to the left of   15
21    6   to the left of    3
22    6   to the left of   11
23    7  to the right of    3
24    7   to the left of    5
25    7  to the right of   12
26    7  to the right of    2
27    7   to the left of   13
28    7               on   11
29    8  to the right of    1
30    8  to the right of   12
31    8  to the right of    3
32    9   to the left of    5
33    9  to the right of    2
34    9  to the right of    3
35    9  to the right of   12
36   11  to the right of    6
37   12   to the left of    5
38   12   to the left of    8
39   12   to the left of    9
40   12   to the left of    7
41   12   to the left of   13
42   13   to the left of    5
43   13  to the right of    7
44   13  to the right of    2
45   13  to the right of   12
46   14   to the left of    3
47   15  to the right of    3
48   15               on    4
49   15  to the right of    6