Discussion
What is a pattern database?
Answer: B
Solving a simplified problem involving only some of the tiles exhaustively, and storing the exact cost of every configuration, gives a very strong admissible heuristic obtainable by a table lookup. Disjoint pattern databases may even be added together. Search histories, pattern matching and learned estimates are different techniques. Spending memory in advance to buy accuracy during search is a trade that modern hardware makes attractive.
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