n=4的一些解
..0..x..1..x…0..x.1..x…0...x..1..x.…0..x.1..x
..x..2…x..0…x..2….x..0….x..2……x..2..x..0….x..2….x..0……x..0
..0..x..3..x.…0..x..3…x.…0…x..1…x
…x..4…x..2…x..1…x..2
..5..x.0..x…4..x.5.x…1..x.4.x…1...x.5.x
…x..3…x..2…x..6…x..3
..2..x.1..x…5..x.4..x…4..x.3..x…3..x.0..x…2..x.3..x
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