Some solutions for n=4
..0..1..0..1..0....0..1..0..1..0....0..1..0..1..0....0..1..0..1..0
..2..1..2..1..2....2..1..2..1..2....2..1..2..1..2....2..1..2..1..2
..0..1..0..1..2....0..1..2..1..0....2..1..0..1..2....0..1..0..1..2
..2..1..0..1..0....2..1..0..1..2....0..1..2..1..2....2..1..0..1..2
..0..1..2..1..0....2..1..2..1..0....0..1..0..1..2....2..1..2..1..0
..0..1..0..1..2....2..1..0..1..0....2..1..0..1..0....2..1..2..1..0
..0..1..2..1..0....2..1..2..1..0....0..1..2..1..0....0..1..2..1..2
..2..1..0..1..2....2..1..0..1..2....0..1..2..1..0....2..1..0..1..0
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