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<!DOCTYPE html>
<math>
<mspace id="baseline" height="1px" width="100px" style="background: black"/>
<mtable id="mtable">
<mtr>
<mtd>
<mspace width="10px" height="10px" style="background: blue"/>
</mtd>
<mtd>
<mspace width="10px" height="10px" style="background: blue"/>
</mtd>
<mtd>
<mspace width="10px" height="10px" style="background: blue"/>
</mtd>
</mtr>
<mtr>
<mtd>
<mspace width="10px" height="10px" style="background: blue"/>
</mtd>
<mtd>
<mspace width="10px" height="10px" style="background: blue"/>
</mtd>
<mtd>
<mspace width="10px" height="10px" style="background: blue"/>
</mtd>
</mtr>
</mtable>
</math>