rewrite-shared-terms-archives.php

<?php

function hck_rewrite_post_types() {
	
	add_rewrite_rule('^articles/([^/]*)/?','index.php?post_type=articles&topics=$matches[1]','top');
	
	add_rewrite_rule('^questions/([^/]*)/?','index.php?post_type=questions&topics=$matches[1]','top');
	
	add_rewrite_rule('^amas/([^/]*)/?','index.php?post_type=amas&topics=$matches[1]','top');
	
}

add_action( 'init', 'hck_rewrite_post_types');