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
..1..0..0..3....1..2..1..1....1..1..1..2....0..3..2..2....0..0..2..0
..0..0..0..3....0..0..0..3....0..0..0..1....1..0..0..1....0..0..0..3
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..1..0..3..1....1..1..3..1....1..3..3..1....0..2..3..3....2..0..2..1
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