[[1,0,0,0],[-1,1,0,0],[-1,0,1,0],[0,-1,0,1]]*[[1,1,1,1],[1,2,1,2],[1,1,2,1],[1,2,1,4]]*transpose([[1,0,0,0],[-1,1,0,0],[-1,0,1,0],[0,-1,0,1]])

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