A Solution Is a State of Affairs
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State
A constraint problem's solution is a state of affairs — an assignment where every requirement holds at once — found somewhere among all conceivable assignments.
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Four variables with three values each: 3 × 3 × 3 × 3 — 81 conceivable assignments, by Unit 2's counting law.
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The multiplication that priced search trees prices this space too; the wall never left.