Discussion
What is variable elimination during preprocessing?
Answer: D
Resolving every clause containing a variable positively against every one containing it negatively removes the variable, and the exchange is worthwhile when the resolvents number fewer than the originals. Unused variables are trivially removable, assignment is search, and renaming is bookkeeping. A transformation applied only when a measurable criterion says it will help, rather than universally, is what makes preprocessing a net gain.
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