How to show data in table?

I made this source example XML

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <sth>
        <something>A</something>
    </sth>
    <sth>
        <something>Z</something>
    </sth>
    <sth>
        <something>E</something>
    </sth>
    <sth>
        <something>R</something>
    </sth>
    <sth>
        <something>T</something>
    </sth>
    <sth>
        <something>Y</something>
    </sth>
</root>

Try this, the trick is to take each fourth element in the list

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
 <xsl:template match="root">
     <table border="1">
         <xsl:for-each select="sth[position() mod 4 = 1]">
             <tr>
                 <xsl:for-each select="self::sth | following-sibling::sth[position() &lt; 4]">
                     <td>
                         <xsl:value-of select="something"/>
                     </td>
                 </xsl:for-each>
             </tr>
         </xsl:for-each>
     </table>
 </xsl:template>
</xsl:stylesheet>

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