Some solutions for n=3
..0..3..3....0..1..2....0..2..2....0..2..2....1..1..2....0..0..1....1..2..2
..0..3..3....0..1..2....2..2..3....2..2..3....1..2..2....1..1..2....1..3..2
..0..3..3....0..2..2....2..3..3....2..2..3....2..2..3....2..3..3....2..3..3
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