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<div align="center" style="border: 1px solid #000; display: inline-block;"> <math><mi>x</mi><mfenced open="{" close=""><mtable> <mtr><mtd><mtext>row 1</mtext></mtd></mtr> <mtr><mtd><mtext>row 2</mtext></mtd></mtr> </mtable></mfenced></math> </div>

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