What is in front of the tree?
The field is in front of the tree.
    src        edge_attr  dst
0     0  to the right of    4
1     0  to the right of    2
2     2   to the left of    0
3     4   to the left of    0
4     4  to the right of    8
5     4          wearing    0
6     4   to the left of    6
7     5  to the right of   12
8     6          holding    7
9     6  to the right of    4
10    6         catching    7
11    6  to the right of   12
12    8   to the left of    4
13   10      in front of   13
14   11   on the edge of   10
15   12   to the left of    6
16   12   to the left of    5