Discussion
What is tabling in a logic programming system?
Answer: D
Memoising subgoals and their answers both prevents infinite loops on left recursive rules and avoids repeating work, which makes a whole class of natural programs terminate. It is the logic programming analogue of dynamic programming. Storage layout, indexing and presentation are different matters. Adding memoisation to a search that repeats subproblems is a general remedy and it applies here with unusual force.
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