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