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 <?php

    if (is_category()) {$this_category = get_category($cat); }



    if($this_category->category_parent)

        $this_category = wp_list_categories('orderby=id&show_count=0&title_li=&use_desc_for_title=1&child_of='.$this_category->category_parent."&echo=0"); 

    else

        $this_category = wp_list_categories('orderby=id&depth=1&show_count=0&title_li=&use_desc_for_title=1&child_of='.$this_category->cat_ID."&echo=0");

    

    if ($this_category) { ?> 

        <ul>

            <?php echo $this_category; ?>

        </ul>

<?php } ?>