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例子
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a(2)=9矩阵为:
[1, 0, 0] [1, 1, 0] [1, 0, 1] [1, 0, 0]
[1, 0, 0] [1, 0, 0] [1, 0, 0] [1, 0, 0]
[0, 1, 0] [0, 1, 0] [0, 1, 0] [0, 1, 1]
[0, 1, 0] [0, 0, 1] [0, 1, 0] [0, 1, 0]
[0, 0, 1] [0, 0, 1] [0, 0, 1] [0, 0, 1]
[0, 0, 1]
.
[1, 1, 1] [1, 1, 0] [1, 1, 0] [1, 0, 1] [1, 1, 0]
[1, 0, 0] [1, 0, 1] [1, 0, 0] [1, 0, 0] [1, 0, 1]
[0, 1, 0] [0, 1, 0] [0, 1, 1] [0, 1, 1] [0, 1, 1]
[0,0,1][0,0,1][0,0,1][0,1,0]
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