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<mrow><mfenced open="(" close=")"><mrow><mtable><mtr><mtd><msub><mi>a</mi><mn>11</mn></msub></mtd><mtd><msub><mi>a</mi><mn>12</mn></msub></mtd></mtr><mtr><mtd><msub><mi>a</mi><mn>21</mn></msub></mtd><mtd><msub><mi>a</mi><mn>22</mn></msub></mtd></mtr></mtable></mrow></mfenced><mfenced open="(" close=")"><mrow><mtable><mtr><mtd><msub><mi>b</mi><mn>1</mn></msub></mtd></mtr><mtr><mtd><msub><mi>b</mi><mn>2</mn></msub></mtd></mtr></mtable></mrow></mfenced><mfenced open="[" close="]"><mrow><mrow><mtable><mtr><mtd><mi>sin</mi></mtd></mtr><mtr><mtd><mi fontweight="bold">sin</mi></mtd></mtr></mtable></mrow></mrow></mfenced></mrow>
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