What watercraft is in the river?
The watercraft is a ship.
   src        edge_attr  dst
0    0      in front of    8
1    1      flying over    3
2    1               in    2
3    1            above    3
4    3               in    4
5    3      in front of    4
6    5   to the left of    6
7    6  to the right of    5
8    6  to the right of    9
9    9   to the left of    6