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