What is on the building?
The cross is on the building.
    src        edge_attr  dst
0     0               on    3
1     0   to the left of    6
2     0  to the right of    1
3     1   to the left of    6
4     1   to the left of    0
5     3   to the left of    9
6     3  to the right of    7
7     3      in front of    9
8     5               on    9
9     6  to the right of    1
10    6      in front of    7
11    6     growing from    7
12    6  to the right of    0
13    7      in front of    9
14    7   to the left of    3
15    9      in front of   11
16    9  to the right of    3
17    9           behind    7
18   11           behind    9