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Which is the correct first order logic expression for the following?
All birds except penguins fly.
∃x bird(x) ∧ ¬penguin(x) ⇒ Fly(x)
∀x bird(x) ∧ penguin(x) ⇒ Fly(x)
∀x bird(x) ⇒ Fly(x)
∀x bird(x) ∧ ¬penguin(x) ⇒ Fly(x)
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