What is in front of the boat?
The life preserver is in front of the boat.
    src        edge_attr  dst
0     2   on the side of    4
1     2      in front of    4
2     3   on the side of    4
3     4      floating on    7
4     4      floating in    7
5     4       sitting in    7
6     4           behind    2
7     5               on    6
8     5  to the right of    8
9     8        on top of    4
10    8   to the left of    5