How to list only child categories?

The following code is to display the subcategory instead of parent .
I am not sure this is the one as you are trying too.

 <ul> 
    <?php 
     $catsy = get_the_category();
     $myCat = $catsy->cat_ID;
        wp_list_categories('orderby=id&child_of=".$myCat); 
    ?>
    </ul>

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