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