Render Items in CQWP without duplicates

CQWP_GroupItem.xslt

 <xsl:template name="OuterTemplate.Body">
      <xsl:param name="Rows" />
      <xsl:param name="FirstRow" />
      <xsl:param name="LastRow" />
      <xsl:variable name="BeginColumn1" select="string('&lt;ul class=&quot;dfwp-column dfwp-list&quot; style=&quot;width:')" />
      <xsl:variable name="BeginColumn2" select="string('%&quot; &gt;')" />
      <xsl:variable name="BeginColumn" select="concat($BeginColumn1, $cbq_columnwidth, $BeginColumn2)" />
      <xsl:variable name="EndColumn" select="string('&lt;/ul&gt;')" />
      <xsl:for-each select="$Rows">
            <xsl:variable name="CurPosition" select="position()" />
            <xsl:if test="($CurPosition &gt;= $FirstRow and $CurPosition &lt;= $LastRow)">
                <xsl:variable name="StartNewGroup" select="@__begingroup = 'True'" />
                <xsl:variable name="StartNewColumn" select="@__begincolumn = 'True'" />
                <xsl:choose>
                    <xsl:when test="$cbq_isgrouping != 'True'">
                        <xsl:if test="$CurPosition = $FirstRow">
                            <xsl:value-of disable-output-escaping="yes" select="$BeginColumn" />
                        </xsl:if>
                    </xsl:when>
                    <xsl:when test="$StartNewGroup and $StartNewColumn">
                        <xsl:choose>
                            <xsl:when test="$CurPosition = $FirstRow">
                                <xsl:value-of disable-output-escaping="yes" select="$BeginColumn" />
                                <!--xsl:call-template name="OuterTemplate.CallHeaderTemplate"/-->
                                <xsl:call-template name="OuterTemplate.CallGroupItem">
                                     <xsl:with-param name="CurPosition" select="$CurPosition" />
                                </xsl:call-template>
                            </xsl:when>
                            <xsl:otherwise>
                                <xsl:call-template name="OuterTemplate.CallFooterTemplate"/>
                                <xsl:value-of disable-output-escaping="yes" select="concat($EndColumn, $BeginColumn)" />
                                <!--xsl:call-template name="OuterTemplate.CallHeaderTemplate"/-->
                                <xsl:call-template name="OuterTemplate.CallGroupItem">
                                    <xsl:with-param name="CurPosition" select="$CurPosition" />
                                </xsl:call-template>
                             </xsl:otherwise>
                        </xsl:choose>
                    </xsl:when>
                    <xsl:when test="$StartNewGroup">
                        <xsl:call-template name="OuterTemplate.CallFooterTemplate"/>
                        <!--xsl:call-template name="OuterTemplate.CallHeaderTemplate"/-->
                        <xsl:call-template name="OuterTemplate.CallGroupItem">
                           <xsl:with-param name="CurPosition" select="$CurPosition" />
                        </xsl:call-template>
                    </xsl:when>
                    <xsl:when test="$StartNewColumn">
                        <xsl:choose>
                            <xsl:when test="$CurPosition = $FirstRow">
                                <xsl:value-of disable-output-escaping="yes" select="$BeginColumn" />
                            </xsl:when>
                            <xsl:otherwise>
                                <xsl:value-of disable-output-escaping="yes" select="concat($EndColumn, $BeginColumn)" />
                            </xsl:otherwise>
                        </xsl:choose>
                    </xsl:when>
                    <xsl:otherwise>
                    </xsl:otherwise>
                </xsl:choose>
                <!--xsl:call-template name="OuterTemplate.CallItemTemplate">
                    <xsl:with-param name="CurPosition" select="$CurPosition" />
                </xsl:call-template-->
                <xsl:if test="$CurPosition = $LastRow">
                  <xsl:if test="$cbq_isgrouping = 'True'">
                    <xsl:call-template name="OuterTemplate.CallFooterTemplate"/>
                  </xsl:if>
                  <xsl:value-of disable-output-escaping="yes" select="$EndColumn" />
                </xsl:if>
            </xsl:if>
        </xsl:for-each>
    </xsl:template>
    <xsl:template name="OuterTemplate.CallGroupItem">
      <xsl:param name="CurPosition" />
      <xsl:value-of disable-output-escaping="yes" select="$BeginListItem" />
      <xsl:apply-templates select="." mode="itemstyle">
              <xsl:with-param name="CurPos" select="$CurPosition" />
         </xsl:apply-templates>
      <xsl:value-of disable-output-escaping="yes" select="$BeginList" />
    </xsl:template>