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We show that if SAT does not have small circuits, then there must exist a small number of satisfiable formulas such that every small circuit fails to compute satisfiability correctly on at least one of these formulas. We use this result to show that if P^N^P^[^1^]=P^N^P^[^2^], then the polynomial-time hierarchy collapses to S"2^p@?@S"2^p@?@P"2^p. Even showing that the hierarchy collapsed to @S"2^p remained open prior to this paper.