Discussion
What does a goal-driven engine waste effort on most often?
Answer: B
A subgoal needed by several rules is proved afresh each time unless the engine caches results, which is why memoisation matters in goal-directed systems. Irrelevant derivation and exhaustive matching are forward-chaining costs, the latter addressed by Rete. Recognising that the two regimes fail in opposite ways is what guides the choice, and hybrid engines exist precisely to get both benefits.
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