What is in front of the green tree?
The flowers are in front of the tree.
    src        edge_attr  dst
0     0               of    5
1     1             near    4
2     2           behind    4
3     2    surrounded by    4
4     3               of    5
5     4               in    9
6     4          next to    5
7     4      in front of    2
8     4          next to    1
9     5  to the right of    7
10    5             near    4
11    5               on    1
12    6               of    5
13    7   to the left of    5
14    8               of    5