Which kind of watercraft is behind the flag?
The watercraft is a ship.
    src        edge_attr  dst
0     0               on    3
1     0      in front of    3
2     0   to the left of   13
3     0  to the right of    8
4     2       looking at    3
5     3   to the left of   10
6     3   to the left of   13
7     3           behind    0
8     3           behind    4
9     3           behind    8
10    4      in front of    3
11    4   to the left of   13
12    6  to the right of    8
13    6   to the left of   13
14    8      in front of    3
15    8  to the right of    9
16    8   to the left of    0
17    8   to the left of    6
18    8   to the left of   13
19    8   to the left of   14
20    9   to the left of    8
21   10  to the right of    3
22   10   to the left of   12
23   12  to the right of   10
24   12  to the right of   13
25   13  to the right of    3
26   13  to the right of    0
27   13  to the right of    8
28   13  to the right of    4
29   13   to the left of   15
30   13  to the right of   14
31   13   to the left of   12
32   13  to the right of    6
33   14  to the right of    8
34   14   to the left of   13
35   15               on   12
36   15  to the right of   13