or perhaps this is more correct
<xsl:function name="f:merge">
<xsl:param name="a"/>
<xsl:param name="b"/>
<xsl:choose>
<xsl:when test="empty($a)">
<xsl:sequence select="$b"/>
</xsl:when>
<xsl:when test="empty($b)">
<xsl:sequence select="$a"/>
</xsl:when>
<xsl:when test="$a[1]=$b[1]">
<xsl:sequence
select="$a[1],f:merge($a[position()!=1],$b[position()!=1])"/>
</xsl:when>
<xsl:when test="$a[1]=$b">
<xsl:sequence select="f:merge($a[position()!=1],$b)"/>
</xsl:when>
<xsl:when test="$b[1]=$a">
<xsl:sequence select="f:merge($a,$b[position()!=1])"/>
</xsl:when>
<xsl:otherwise>
<xsl:sequence
select="$a[1],$b[1],f:merge($a[position()!=1],$b[position()!=1])"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>
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