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Yes only in one of the cases then if you have something changed in the link structure and you want google to send his crawlers on your website.
Regularly for a good crawler indexing you need to upload also the sitemap, every time when you upload files on the server, I mean the updated files with the changes made on the link structure of your website.
Also in google webmaster tools they give you a security key, you should put that in meta tags on every page of the site.
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