<math xmlns = "https://www.w3.org/1998/Math/MathML"> <mrow> <mo>[</mo> <mtable> <mtr> <mtd><mn>1</mn></mtd> <mtd><mn>0</mn></mtd> <mtd><mn>0</mn></mtd> </mtr> <mtr> <mtd><mn>0</mn></mtd> <mtd><mn>1</mn></mtd> <mtd><mn>0</mn></mtd> </mtr> <mtr> <mtd><mn>0</mn></mtd> <mtd><mn>0</mn></mtd> <mtd><mn>1</mn></mtd> </mtr> </mtable> <mo>]</mo> </mrow> </math>
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