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Suppose (3x) Px is a premise in a proof (derivation) and that Pa is assumed. Now assuming that a is not already present in the

Suppose (3x) Px is a premise in a proof (derivation) and that Pa is assumed. Now assuming that a is not already present in the proof, suppose in this subproof Qa is derived. Is it permissible to derive Oa from (3x) Px and the subproof using 3 E

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