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