What's the ground covered with?
The ground is covered with grass.
    src        edge_attr  dst
0     1  to the right of   12
1     2          washing   12
2     2  to the right of   12
3     3   to the left of   13
4     4     covered with    9
5     6   to the left of    9
6     6               on   14
7     7   to the left of   13
8     8           riding    7
9     8          wearing    3
10    9  to the right of   14
11    9  to the right of    6
12   12   to the left of    2
13   12   to the left of    1
14   12               in    0
15   13  to the right of    3
16   13  to the right of    7
17   14   to the left of    9