Discussion
How is the assignment trail of a solver organised?
Answer: D
Each chosen assignment opens a new level, and everything propagated from it belongs to that level, so backjumping means returning to a specified earlier level. Conflict analysis computes which level to return to. Unsatisfied counts, priorities and watches are different quantities. Organising the assignment trail by decision level is what makes non-chronological backtracking expressible at all.
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