What's on the water?
The ship is on the water.
    src        edge_attr  dst
0     0   to the left of    3
1     1               on   16
2     1  to the right of   18
3     1  to the right of   17
4     1  to the right of    9
5     2   to the left of   12
6     3   to the left of    4
7     3  to the right of    0
8     3   to the left of   14
9     3  to the right of    9
10    4  to the right of    3
11    6  to the right of    8
12    6  to the right of   12
13    7               on   16
14    8  to the right of   14
15    8   to the left of    6
16    8               on    6
17    9   to the left of   13
18    9   to the left of    1
19    9   to the left of    3
20    9               on   16
21   10   to the left of   12
22   10               by   15
23   10               on   16
24   11               on   16
25   12  to the right of   10
26   12  to the right of   15
27   12   to the left of    6
28   12  to the right of    2
29   12  to the right of   14
30   13               in   11
31   13  to the right of    9
32   14   to the left of    8
33   14   to the left of   12
34   14  to the right of    3
35   15   to the left of   16
36   15               on   16
37   15   to the left of   12
38   16  to the right of   15
39   17   to the left of    1
40   17   to the left of   18
41   17               in   18
42   18  to the right of   17
43   18   to the left of    1