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You should check your sitemap periodically to ensure that Google is not facing any problem. Once you submit you blogs, you are not required to submit it again. The only thing, which you have to do, is to keep your sitemap up to date. If you install a sitemap plugin, you can give updates to Google regarding the changes on your blog. A number of blogging software programs can be also used for generating sitemaps and you should check the tools of search engines to locate such a program.