Consider the following Gauss-Jordan reduction: ¯1 2 0 -3 0 0 1 0 -3 1 0 0 1 2 0 0 1 2 0 0 0 1 1 0 0 0 2 0 0 0 1 1 1 1 E‚A E,ĒĻA E,E,E,A E2 E4 = %3D %3|

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