rank({{1,1,1,0,0,0,0,0,0},{0,0,0,1,1,1,0,0,0},{0,0,0,0,0,0,1,1,1},{1,0,0,1,0,0,1,0,0},{0,1,0,0,1,0,0,1,0},{0,0,1,0,0,1,0,0,1}})

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