What contains tree?
The dirt contains tree.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of    8
2     1  to the right of   10
3     1  to the right of    2
4     2               on    3
5     2      in front of    7
6     2           behind    3
7     2   to the left of    1
8     2  to the right of    5
9     2        on top of    3
10    2   to the left of   12
11    2   to the left of    8
12    3          contain    2
13    5          wearing   11
14    5   to the left of   11
15    5   to the left of    2
16    6  to the right of    9
17    7           behind    2
18    8  to the right of    0
19    8  to the right of    2
20    8  to the right of   10
21    9   to the left of    6
22    9               on    2
23    9        on top of    2
24   10       playing on    3
25   10   to the left of    1
26   10   to the left of    8
27   10   to the left of   12
28   11  to the right of    5
29   12  to the right of    2
30   12  to the right of   10
31   12  to the right of    0