Some solutions for 4X9
..0..0..0..0..0..0..0..0..3....0..0..0..0..0..0..0..0..0
..0..0..0..0..0..0..0..1..4....0..0..0..0..0..0..0..0..2
..0..0..0..0..0..0..0..2..3....0..0..0..0..0..0..0..0..5
..0..0..0..0..0..0..3..5..5....0..0..0..0..0..0..0..5..5
|