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<math> <mrow> <mi>x</mi> <mstyle background="#000099"> <mspace height="1ex" width="1ex"/> </mstyle> <mi>M</mi> <mstyle background="#000099"> <mspace height="1ex" depth="1em" width="1ex"/> </mstyle> <mi>x</mi> <mstyle background="#000099"> <mspace depth="2mm" width=".2in"/> </mstyle> </mrow> </math>