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{{1,0,1,0},{0,1,0,1},{1,0,-1,0},{0,1,0,-1}} . {{1,1,1,-1},{1,1,-1,1},{1,-1,1,1},{-1,1,1,1}} . {{1,0,1,0},{0,1,0,1},{1,0,-1,0},{0,1,0,-1}}