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..3…x..2..x..0…x..2
..3…x..4…x…3…x..4..x…4…x..0..x…1…x..4.x…4..x..1..x
…x..2…x..3…x..2..x..1…x..5…x..4…x..2..x..0…x..5..x..0
..1..x.0..x…5..x.6..x…1..x.3..x…3..x.1..x…6..x.7..x
…x..2…x..1…x..1..x..3…x..4…x..5…x..2..x..0…x..4..x..2
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