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is not strictly forbidden for individual trajectories, only astronomically unlikely), constructor theory reframes the question: rather than asking what will happen given initial conditions, it asks whether a constructor -- a device that could reliably cause the reverse transformation and retain the ability to do so again -- is possible. In constructor-theoretic terms, dissolving dye is a possible task, but its transpose is impossible: no constructor for reliably reversing the process can exist under the laws of physics, even though the underlying

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