Some solutions for 6X4
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..1..5..7....0..0..6..6....0..1..5..5....0..0..6..7....0..1..4..6
..7..4..2..7....0..5..1..4....4..3..2..6....2..5..3..3....1..5..0..3
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