What type of watercraft is the building behind of?
The building is behind the boats.
    src        edge_attr  dst
0     0               in    5
1     0      floating in    5
2     0  to the right of   13
3     1               in    5
4     1   to the left of   20
5     1      in front of    4
6     1  to the right of    7
7     1   to the left of   13
8     2          driving    3
9     2               in    3
10    4           behind    1
11    4   to the left of   13
12    4   to the left of    8
13    5             near   15
14    6               in    5
15    6               on    5
16    6  to the right of   13
17    7   to the left of   16
18    7   to the left of    1
19    7   to the left of   20
20    8  to the right of    4
21    8   to the left of   13
22    9   to the left of   19
23   10   to the left of   13
24   12      flying over    5
25   12  to the right of   13
26   12        flying in   17
27   13  to the right of   20
28   13  to the right of   10
29   13  to the right of    8
30   13   to the left of    0
31   13  to the right of   14
32   13  to the right of    1
33   13   to the left of   12
34   13   to the left of    6
35   13  to the right of   16
36   13  to the right of    4
37   14   to the left of   13
38   14   to the left of   16
39   14   to the left of   20
40   15             near    5
41   16  to the right of    7
42   16  to the right of   14
43   16   to the left of   13
44   16               of   20
45   18               on    9
46   18               in    9
47   19  to the right of    9
48   20  to the right of    7
49   20   to the left of   13
50   20  to the right of   14
51   20  to the right of    1