What vehicle is the house in front of?
The house is in front of the truck.
    src        edge_attr  dst
0     1  to the right of    4
1     1   to the left of    2
2     2  to the right of    1
3     2           behind    3
4     2  to the right of    5
5     3      in front of    2
6     4   to the left of    5
7     4   to the left of    1
8     4   to the left of    8
9     5   to the left of    2
10    5  to the right of    4
11    5               of    8
12    6  to the right of    8
13    6          next to    9
14    6             near    9
15    8  to the right of    4
16    8           behind    9
17    8   to the left of    6
18    9      in front of    8
19    9             near    6