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Route Group
A Route Group allows you to group multiple path segments within a parent folder for better project organization. It is excluded from the route's URL path,
Notice below how (common) is not part of the URL.
If you use a different layout.js file for each route group and navigate across multiple root layouts, there will be a full page load (as opposed to a client-side navigation). For example, navigating from /cart that uses app/(shop)/layout.js to /blog that uses app/(marketing)/layout.js will cause a full page load.