hello, members, i want to know something regarding sitemap file... as i know 50000 are links are allowed in google sitemap, sitemap max size 10 mb .. but , if the sitemap contains 404 pages - like few pages has been deleted or absent what will be the effect ? if the sitemap conatains duplicate links , what will be the result ? will it hurt seo ranking ? will it cause derank ? thank you to guru's who will answere in advance ! happy january !