What is in front of the tree that is not short?
The bus is in front of the tree.
    src        edge_attr  dst
0     0   to the left of   11
1     0  to the right of    9
2     1   to the left of    3
3     2  on the front of   10
4     3  on the front of   10
5     3  to the right of    1
6     3  to the right of    5
7     5   to the left of    3
8     7           behind   10
9     7  to the right of    8
10    8           behind   10
11    8   to the left of    7
12    9   to the left of    0
13   10        parked on    6
14   10      in front of    7
15   10      in front of    8
16   11  to the right of    0
17   11        on top of    6