What is the sidewalk made of?
The side walk is made of concrete.
    src        edge_attr  dst
0     0               on    8
1     0  to the right of   10
2     0           behind    1
3     0  to the right of    7
4     0  to the right of    1
5     1   to the left of    8
6     1  to the right of    9
7     1   to the left of   11
8     1      in front of    0
9     1      in front of    8
10    1   to the left of    0
11    1   to the left of    7
12    1  to the right of   15
13    1   to the left of   12
14    1          wearing    4
15    3  to the right of   15
16    3   to the left of   10
17    3   to the left of    8
18    4  to the right of    9
19    5   to the left of   10
20    5   to the left of    8
21    5  to the right of   15
22    5   to the left of   11
23    7  to the right of   10
24    7               on    8
25    7   to the left of    0
26    7  to the right of    1
27    8           behind    1
28    8  to the right of    5
29    8  to the right of   15
30    8  to the right of   10
31    8  to the right of    1
32    8  to the right of   13
33    8  to the right of    3
34    9   to the left of    4
35    9   to the left of    1
36   10  to the right of   13
37   10  to the right of    5
38   10   to the left of    7
39   10   to the left of    8
40   10   to the left of   11
41   10  to the right of   15
42   10   to the left of    0
43   10  to the right of    3
44   10   to the left of   12
45   11  to the right of    1
46   11  to the right of   10
47   11  to the right of    5
48   12  to the right of    1
49   12  to the right of   10
50   13  to the right of   15
51   13   to the left of    8
52   13   to the left of   10
53   15   to the left of    5
54   15   to the left of    1
55   15   to the left of    3
56   15   to the left of    8
57   15   to the left of   10
58   15   to the left of   13
59   15           beside    9