Some solutions for 4X6
..0..0..0..0..0..2....0..0..0..0..0..6....0..0..0..0..0..3....0..0..0..0..0..1
..0..0..0..0..0..6....0..0..0..0..1..2....0..0..0..0..0..6....0..0..0..0..0..4
..0..0..0..0..1..2....0..0..0..0..1..5....0..0..0..0..2..3....0..0..0..0..0..4
..0..0..0..0..1..4....0..0..0..0..2..2....0..0..0..0..3..6....0..0..0..0..7..3
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