Yesterday I wrote:
If we allow holes, I like the 5x6 with two holes. There's only one distinct such pattern, [...]
Nonsense. There are three. My program says: With the two holes at the corners on a long side, 0 solutions. With the two holes at diagonally opposite corners, 1 distinct solution, in yesterday's email. With the two holes at the corners on a short side, 9 distinct solutions: 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 3 3 4 4 5 3 3 4 4 5 3 3 4 5 1 3 3 4 5 1 3 3 4 5 1 6 7 8 6 1 6 7 8 6 1 6 2 4 6 6 6 2 4 6 6 6 7 4 6 6 6 2 5 5 7 6 5 2 2 7 7 2 8 8 9 7 2 8 8 9 8 7 2 2 9 9 2 3 9 7 9 5 3 9 7 1 9 3 7 9 7 9 3 7 1 1 9 3 8 9 1 8 8 9 4 1 8 8 9 4 8 5 5 7 4 4 9 5 5 8 7 5 5 8 4 1 1 2 1 2 3 1 2 3 1 2 3 3 3 4 5 1 2 4 5 3 4 2 4 5 3 4 3 4 2 5 5 6 7 4 6 6 6 4 7 8 8 6 4 7 8 8 6 4 7 7 8 8 7 2 2 9 6 9 1 1 5 8 9 1 1 5 6 5 1 6 2 8 9 3 8 1 8 9 3 6 5 2 9 3 6 5 9 9 1 8 9 4 9 5 5 7 2 2 7 7 9 2 7 7 6 9 7 3 3 8 4 -- Mike