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For these formulas, which are free vars and which aren't?1. ∀x(∃yP(x,y,z) → ∀zQ(y,z))2. ∃x(P(x) ∧ ∀yQ(y,z))3. ∀x∃y(P(x,z) ∨ Q(y)) ∧ R(x,z)
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