wp_list_categories set order manually?

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Is it possible to do this? In the codex the 'orderby' option does not allow manual ordering (only ascending ID, name, count, slug etc). Here is the code: <?php wp_list_categories('include=16,17,15&title_li=<h3>' . __('By Content') . '</h3>' ); ?> This is currently alphabetical since I havent included the 'orderby' statement. I want them ordered 17,15,16 but only these 3 cats which are not…

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