Discussion
When must an arc be revisited during AC-3?
Answer: D
Deleting a value from a domain may remove the support some neighbour was relying on, so every arc directed into the changed variable is put back on the queue. Re-queuing everything would be correct but wasteful. Constraint addition and assignment are different events. Revisiting only what a change can possibly have invalidated is what keeps an incremental algorithm efficient, and identifying that set precisely is the design work.
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