Discussion
What are the four states a clause may occupy during a search?
Answer: A
Tracking whether a clause is already true, already false, forcing a single assignment or still open is exactly what the solver's data structures maintain, and doing so efficiently with watched literals is a large part of a modern implementation's speed. The other lists describe clause origins, resolution operations and literal polarities. Reducing a data structure's job to four states, and then implementing the transitions efficiently, is how a conceptually simple algorithm becomes a fast one.
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