[Zope] <dtml-let> syntax

[Sebal]

I want to test in a sequence if sequence-index is multiple of 4

I think I can with fmod(sequence-index,4)=0 but I don't find the right
syntax:


I tried directly in the <dtml-if> tag and with a <dtml-let> tag like :
(I tried with or without " [ _[ ' .... nothing works)

   <dtml-in SQLmotcle_query>
   <TD CELLPADDING="0" CELLSPACING="0" VALIGN=MIDDLE ALIGN=LEFT>
    <dtml-let x=fmod(sequence-index,4))>
     <dtml-if x>  poipoi
     <dtml-else>  pokpok  
     </dtml-if>
    </dtml-let>
   </dtml-in></TD></TR>

What is the right syntax, or is there another way to test this.
thanx.

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