NS Advanced PDF/HTML: display TaxCode values without repetition

Question

I have an Invoice Template for which I want to display a table as a summary of VAT (TVA), so for example if I have three items with the same TVA and one item with different TVA code, I should display two lines of TVA, one with the sum of amounts of the other lines, and the second line of TVA correspond to the unique TVA.

I currently have the below code in the Template, which doesn't work correctly.

<table class="itemtable" style="margin-top:10px;width:100%;"><!-- start items --><#list record.item as item><#list record.item as items> <#if items_index==0><#if item_index==0>
  <thead>
    <tr>
	<th colspan="5"  line-height="150%" style="font-weight: bold;background-color: rgb(255, 255, 255);padding: 4x 2px;">TVA</th>
	</tr>
  <tr>
   <td>Code</td>
	 <td>VAT</td>
 	 <td>VAT%</td>
	 <td>Amount</td>
   <td>&nbsp;</td>
  </tr></thead></#if></#if>
  <tr>
   <#if !(items.taxcode?matches(item.taxcode))>
    <td>${item.taxcode} ${items.taxcode} </td>
	  <td>${item.tax1amt}</td>
	  <td>${item.taxrate1}</td>
	  <td>${item.amount}</td>
	  <td>&nbsp;</td>
   </#if>
   </tr></#list></#list><!-- end items --></table>

Is there a way to get list of TVA present at the line of item without repetition in freemarker template?