<xsl:template match="parentofentry">
...
<xsl:for-each select="ENTRY">
<xsl:variable name="x" select="substring(KEYWORD,1,2)"/>
<xsl:if test="$x != substring(following-sibling::ENTRY[1]/KEYWORD,1,2)">
<a href="#all{$x}s"><xsl:value-of select="$x"/></a>
</xsl:if>
</xsl:for-each>
..
<xsl:template match="ENTRY">
...
<xsl:variable name="x" select="substring(KEYWORD,1,2)"/>
<xsl:if test="$x != substring(following-sibling::ENTRY[1]/KEYWORD,1,2)">
<h2><a name="all{$x}s"/><xsl:value-of select="$x"/></h2>
</xsl:if>
.....
..
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