What is the watercraft in the ocean?
The watercraft is a ship.
    src        edge_attr  dst
0     0               in    1
1     0   to the left of    4
2     3               of    4
3     4  to the right of    0
4     7               in    2
5     7  to the right of    8
6     8   to the left of    7
7    10   to the left of   13
8    10               on    5
9    10   to the left of   12
10   11               on    5
11   12  to the right of   10
12   12               on    5
13   12   to the left of   14
14   13               on    5
15   13   to the left of   14
16   13  to the right of   10
17   14  to the right of   12
18   14  to the right of   13
19   14               on    5