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