Are there any benches that are not made of concrete?
No, there is a bench but it is made of concrete.
    src        edge_attr  dst
0     0  to the right of    7
1     0  to the right of   10
2     1               of    2
3     1   to the left of   14
4     1   to the left of    7
5     1   to the left of   10
6     2               on    6
7     2   to the left of   14
8     2   to the left of    7
9     2   to the left of   10
10    3   to the left of    4
11    4   to the left of    7
12    4  to the right of    3
13    5  to the right of   10
14    5  to the right of    7
15    5  to the right of   14
16    5   to the left of    8
17    5   to the left of   12
18    7  to the right of    2
19    7   to the left of    5
20    7   to the left of   10
21    7  to the right of    1
22    7   to the left of    0
23    7  to the right of    4
24    7               on    6
25    8  to the right of    5
26    8  to the right of   13
27    8  to the right of    9
28    8               on    9
29    9   to the left of    8
30    9   to the left of   11
31   10  to the right of    2
32   10   to the left of   11
33   10   to the left of   12
34   10  to the right of    7
35   10  to the right of    1
36   10   to the left of    0
37   10               on    6
38   10   to the left of    5
39   11               of    5
40   11  to the right of   10
41   11  to the right of    9
42   12  to the right of   10
43   12  to the right of    5
44   12               on    6
45   12  to the right of   13
46   13   to the left of   12
47   13   to the left of    8
48   14               of    7
49   14  to the right of    1
50   14  to the right of    2
51   14   to the left of    5