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EXAMPLE
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The a(2) = 9 matrices are:
[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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