Discussion
Why does the set of support strategy preserve completeness?
Answer: D
If the premises are consistent, any contradiction must involve the negated goal, so resolutions among the premises alone can be skipped without losing the proof. That condition must actually hold, and it usually does. Order restriction and universal harmlessness are false. A restriction justified by an argument about where a contradiction must lie is far stronger than one adopted heuristically, and it is worth checking that the argument's premise holds. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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