对于4X4,a(1,1)=0的一些解
..0...0...0...0...0...1...0...0...0...2...0...0...0...0...0...0...0...1...2...0
..0..0..1..0....2..1..2..2....0..1..2..0....0..0..2..0....1..0..0..2
..1..2..2..1....1..1..0..1....0..0..1..0....1..2..0..1....2..0..0..1
..1..1..1..1..1...0..1..0...0...0...2...0...0...0...0...0...2...0...0...0...0...0...0...0...1...2
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