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norm[{{1,0,2,3},{2,1,3,5},{4,1,1,2},{0,3,4,3}}+{{3,0,4},{1,5,2},{7,1,3},{2,2,1}}*{{p,q},{r,s},{t,u}}*{{1,0,2,3},{2,1,3,5}},infty
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