Do you see a boat that is not brown?
No, there is a boat but it is brown.
    src        edge_attr  dst
0     0               on   10
1     0               in   10
2     0  to the right of    2
3     0  to the right of    8
4     0   to the left of    3
5     2   to the left of    0
6     2   to the left of    3
7     3  to the right of    2
8     3  to the right of    0
9     3  to the right of    8
10    3  to the right of    4
11    4  to the right of    8
12    4   to the left of    3
13    8   to the left of    4
14    8   to the left of    3
15    8   to the left of    0