What is in front of the tall buildings?
The trees are in front of the buildings.
    src        edge_attr  dst
0     1   to the left of    8
1     1   to the left of   10
2     1   to the left of    2
3     2   to the left of   13
4     2   to the left of   10
5     2  to the right of    1
6     2  to the right of   17
7     2   to the left of   11
8     3            above   14
9     4   to the left of    9
10    5               on    9
11    6   to the left of   12
12    6   to the left of    9
13    8           behind   13
14    8  to the right of    1
15    8  to the right of   17
16    9  to the right of    4
17    9  to the right of   12
18    9  to the right of   13
19    9  to the right of    6
20   10  to the right of   11
21   10  to the right of   17
22   10   to the left of   13
23   10  to the right of    1
24   10  to the right of    2
25   11  to the right of    2
26   11   to the left of   10
27   11           behind   15
28   11  to the right of   17
29   11   to the left of   13
30   12  to the right of    6
31   12   to the left of    9
32   13   to the left of    9
33   13  to the right of    2
34   13  to the right of   11
35   13      in front of    8
36   13  to the right of   10
37   15      in front of   11
38   17   to the left of    8
39   17   to the left of   11
40   17   to the left of    2
41   17   to the left of   10