Is the sidewalk made of cobblestone or cement?
The sidewalk is made of cement.
    src         edge_attr  dst
0     0   to the right of    2
1     2    to the left of    5
2     2    to the left of    4
3     2   to the right of    9
4     2    to the left of    3
5     2    to the left of    0
6     3   to the right of    2
7     3   to the right of   14
8     3   to the right of   12
9     4   to the right of   12
10    4   to the right of    2
11    4   to the right of   14
12    5        walking on    0
13    5   to the right of    2
14    5   to the right of   14
15    5   to the right of   12
16    5           wearing    4
17    8                of    1
18    9                on   13
19    9    to the left of   11
20    9    to the left of    2
21    9  parked alongside   13
22   10           wearing    7
23   11   to the right of    9
24   11    to the left of   12
25   11                on   13
26   11  parked alongside   13
27   12    to the left of    3
28   12    to the left of    4
29   12    to the left of    5
30   12   to the right of   11
31   12    to the left of   14
32   12                on   13
33   14    to the left of    5
34   14   to the right of   12
35   14    to the left of    3
36   14    to the left of    4