Discussion
How does a planner search backwards from its goal?
Answer: C
Regression takes a set of goal conditions and asks which actions could have achieved one of them, replacing it by that action's preconditions. It considers only relevant actions, which is its advantage, but the states it manipulates are partial descriptions rather than complete ones. The other options describe different techniques. Searching backwards restricts attention to what could possibly matter, which is exactly what forward search lacks. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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