What is on the building near the tree?
The flag is on the building.
    src        edge_attr  dst
0     0             near    2
1     0   to the left of    3
2     0   to the left of    2
3     0   to the left of    5
4     0   to the left of    4
5     2  to the right of    0
6     2             near    0
7     3  to the right of    0
8     3               on    2
9     4  to the right of    0
10    5               on    4
11    5  to the right of    0