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