Are there any boats?
No, there are no boats.
     src        edge_attr  dst
0      0  to the right of   19
1      0  to the right of   18
2      0  to the right of   31
3      0  to the right of   27
4      0  to the right of   10
..   ...              ...  ...
331   39   to the left of   35
332   39   to the left of   30
333   39   to the left of   17
334   39   to the left of   18
335   39   to the left of   27

[336 rows x 3 columns]