<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="1.0">

<xsl:output indent="yes"/>

<xsl:key name="x" match="dig" use="generate-id(preceding-sibling::*[not(self::dig)][1])"/>

<xsl:template match="top">
<top>
<xsl:for-each select="*[not(self::dig)]">
<group>
<xsl:copy-of select=".|key('x',generate-id(.))"/>
</group>
</xsl:for-each>
</top>
</xsl:template>

</xsl:stylesheet>

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