What vehicle is the surfboard on?
The surfboard is on the truck.
    src        edge_attr  dst
0     3               of    8
1     3  to the right of    4
2     4   to the left of    3
3     4   to the left of    5
4     4               of    8
5     5  to the right of    4
6     6               of    8
7     7               on    8
8     7   to the left of   11
9     7        on top of    8
10    8               on   10
11    8  to the right of    9
12    9               on   10
13    9   to the left of    8
14   11  to the right of    7