What material is the ground?
The ground is made of concrete.
    src        edge_attr  dst
0     0   to the left of    9
1     2          wearing    7
2     2          wearing    3
3     4             near   15
4     4             near    8
5     6  to the right of   10
6     8             near    4
7     9  to the right of    0
8    10  to the right of   11
9    10   to the left of    6
10   10  to the right of   15
11   10  to the right of   14
12   11             with   14
13   11            below   14
14   11            under   14
15   11          holding   14
16   11          holding    1
17   11   to the left of   10
18   14            above   11
19   14   to the left of   10
20   15   to the left of   10
21   15             near    4