What is the ground made of?
The ground is made of cement.
    src        edge_attr  dst
0     0   to the left of    7
1     2   to the left of    8
2     5   to the left of   10
3     5   to the left of    9
4     6         watching    7
5     6           behind    7
6     7        on top of    2
7     7      in front of   10
8     7      in front of    6
9     7   to the left of    8
10    7  to the right of    0
11    7   to the left of   10
12    7   to the left of    9
13    8  to the right of    7
14    8  to the right of    2
15    9         watching    7
16    9  to the right of   10
17    9  to the right of    5
18    9  to the right of    7
19   10  to the right of    7
20   10  to the right of    5
21   10         watching    7
22   10   to the left of    9
23   10           behind    7