What is the bench made of?
The bench is made of concrete.
    src        edge_attr  dst
0     0  to the right of    2
1     0   to the left of    3
2     1      in front of   16
3     1             near   11
4     1   to the left of   10
5     1   to the left of   12
6     1   to the left of   14
7     2   to the left of    3
8     2   to the left of    0
9     3  to the right of    0
10    3  to the right of    2
11    4           inside    5
12    4      in front of   11
13    6  to the right of   11
14    8  to the right of   11
15   10  to the right of   12
16   10  to the right of    1
17   11           behind   16
18   11             near    1
19   11           behind    4
20   11   to the left of    6
21   11   to the left of    8
22   11   to the left of   15
23   12  to the right of    1
24   12   to the left of   10
25   14  to the right of    1
26   15  to the right of   11
27   16      in front of   11