Do you see both flags and boats?
Yes, there are both a boat and a flag.
    src        edge_attr  dst
0     0   to the left of   13
1     0  to the right of    4
2     0  to the right of    1
3     0  to the right of    5
4     1   to the left of    2
5     1   to the left of   20
6     1   to the left of   15
7     1   to the left of    0
8     2  to the right of    1
9     2  to the right of   12
10    2  to the right of   11
11    3  to the right of   11
12    3  to the right of   21
13    4   to the left of    0
14    4   to the left of    5
15    4   to the left of   20
16    5  to the right of    4
17    5   to the left of    0
18    9   to the left of   21
19   10          next to   11
20   10   to the left of   16
21   10             near   11
22   11             near   10
23   11   to the left of    3
24   11   to the left of   12
25   11   to the left of    2
26   12   to the left of    2
27   12  to the right of   11
28   12  to the right of   21
29   13             near   18
30   13  to the right of    0
31   15  to the right of    1
32   15   flying through   19
33   16  to the right of   10
34   18          next to   13
35   20  to the right of    4
36   20  to the right of    1
37   21  to the right of    9
38   21   to the left of   12
39   21   to the left of    3