What is in front of the houses?
The train is in front of the houses.
    src        edge_attr  dst
0     1           behind    5
1     2       covered by    3
2     3   to the left of   20
3     3         covering    2
4     4   to the left of   11
5     4  to the right of   15
6     4   to the left of   14
7     5      in front of   13
8     5      in front of    1
9     6  to the right of   11
10    6   to the left of   21
11    7   to the left of   12
12    8               on    7
13    8   to the left of   12
14   10  to the right of   17
15   11  to the right of    4
16   11   to the left of    6
17   11  to the right of   14
18   11   to the left of   21
19   12  to the right of    7
20   12  to the right of    8
21   13           behind    5
22   14  to the right of    4
23   14   to the left of   11
24   14  to the right of   15
25   15   to the left of   14
26   15   to the left of    4
27   17   to the left of   10
28   20  to the right of    3
29   21  to the right of    6
30   21  to the right of   11