How to Change WordPress Permalinks without affecting Google

WordPress Permalinks, first key to make your site SEO friendly. But wordpress by default uses the permalinks structures such as
/%year%/%monthnum%/%day%/%postname%/
and this is not really a good idea cause it will return your topics url which will look like this below
http://www.abc.com/2008/07/31/your-post-slug/
And say for the instance you’ve already has a handful of topics that has been posted for a while and google has indexed it. So now you want to change your WordPress Permalinks to a much more friendly url settings such as
http://www.abc.com/your-post-slug/
Yes you can easily upgrade your structure from WordPress Admin options but all the links indexed by google wont be able to land on the proper topics.

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