n=4的一些解
..0..1..2..0....0..1..2..1....0..1..0..2....0..1..2..1....0..1..2..0
..0..1..1...2...2...0...2...2...0..1..0...2...0..1..2...0...2...0...2...2...2...2...2...1...0
..1..2..0..1....1..2..1..1....2..0..2..1....0..1..0..2....1..0..2..2
..1..0..2..1....2..0..2..1....0..1..0..2....2..0..1..0....0..1..0..2
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