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Devices and systems designed to operate across five dimensions: spacetime plus probability. 5D technologies allow users to perceive, navigate, and potentially select among probability branches. The "probability branch viewer" shows you what your life would be like if you'd made different choices—if you'd taken that job, married that person, bought that stock. The "branch stabilizer" helps you stay in your desired probability branch (useful when you're having a good day and don't want to slip into a branch where everything goes wrong). And the "regret eraser" lets you visit branches where you made better choices, which either cures regret or makes it worse, depending on how well you handle seeing happier versions of yourself.
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