How does DedeCMS arclist tag realize two-column arrangement in tables and lists?

<table> 
<tr> 
{dede:arclist row=&#39;10&#39;} 
<td><a href="[field:arcurl/]">[field:title/]</a></td> 
[field:global.autoindex runphp=&#39;yes&#39;] 
if((@me % 2) == 0 && @me <> 10) 
{ 
@me = &#39;</tr></tr>&#39;; 
} 
else{ 
@me = &#39;&#39;; 
} 
[/field:global.autoindex] 
{/dede:arclist} 
</tr> 
</table> 
<ul> 
<li> 
{dede:arclist row=&#39;10&#39;} 
<a href="[field:arcurl/]">[field:title/]</a> 
[field:global.autoindex runphp=&#39;yes&#39;] 
if((@me % 2) == 0 && @me <> 10) 
{ 
@me = &#39;</li><li>&#39;; 
} 
else 
{ 
@me = &#39;&#39;; 
} 
[/field:global.autoindex] 
{/dede:arclist} 
</li> 
</ul>