The left-sorted patterns connect all four corners with a single black region. - Rhodri Prysor, Oct 16 2024
The left-sorted patterns connect all four corners in a single stroke. - Rhodri Prysor, Oct 16 2024
No entirely white paths from one side to another vs. one can find such a path.
There are no white paths from one side to another vs. one can find such a path.
There exists a white path from one side to another vs. not so.
Leo Crabbe