What is the boat in front of?
The boat is in front of the tree.
    src        edge_attr  dst
0     0   to the left of    8
1     0           behind   18
2     2               on    9
3     3               on   18
4     4               by   12
5     4   to the left of   15
6     5           behind    9
7     5  to the right of   10
8     6   to the left of   10
9     8           behind   18
10    8  to the right of    0
11    8   to the left of   14
12    8   to the left of   11
13    8   to the left of   13
14    8   to the left of   18
15    8           behind   12
16    9               on   12
17    9      in front of    5
18   10  to the right of    6
19   10   to the left of    5
20   11  to the right of    8
21   11   to the left of   13
22   12      in front of    8
23   12            below   18
24   13  to the right of   11
25   13  to the right of   18
26   13  to the right of    8
27   14               on   18
28   14  to the right of    8
29   15  to the right of    4
30   15           beside   12
31   16   to the left of   17
32   17  to the right of   16
33   18   to the left of   13
34   18  to the right of    8