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<?php
$child_ids = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE $wpdb->posts.post_parent = 134  AND $wpdb->posts.post_type = 'page' AND $wpdb->posts.post_status = 'publish' ORDER BY $wpdb->posts.ID ASC");
$exclude = implode($child_ids,', ');
wp_list_pages('exclude=' . $exclude . '&title_li=');
?>