iterator tag: how to set iterate step?

[samsun]

I have array to iterate through using iterator tag, for each loop i want to
print out pair of array's element
the last row could have only one element if the array length is odd. for
example, i want to dump arrays into table , each row has two element.

arrays {1,2,3,4,5} 

<tr>
  <td>1</td>   <td>2</td>
</tr>
 
<tr>
 <td>3</td>   <td>4</td>
</tr>

<tr>
 <td>5</td> 
</tr>


each loop's step should set to 2, but looks like there is no step attribute
for the iterator tag.
any idea how to do this

thanks,

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