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    Regression algorithm:

  1. Start with the goal

  2. Choose an action that will result in the goal

  3. Replace that goal with the action’s preconditions

  4. Repeat steps 2-3 until you have reached the initial state

  • Regression explores only states that are relevant for G; they may not be reachable from I
  • Regression is not as non-natural as you might think: if you plan a trip to Thailand, do you start with thinking about the train to Frankfurt?

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