Show by explicit matrix multiplication that 11 12 13 4 21 21 1 41 1 1 1
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а11 а12 а13 ај4 а21 а21 аз1 а41 аз1 аз1 аз1 а41 а41 а41 аз1 041 а11 а12 а13 ај4 а21 а22 аз1 а41 аз1 аз1 аз1 а41 а41 а41 аз1 а41 1000 0 1 0 0 0 0 1 0 0 0 0 1
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