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Complete the following derivation:
⋮
n. ( ( ∀ x ) ( ∀ y ) ( P ( x ) → R ( x , y ) ) → ( ∀ x ) ( P ( x ) → ( ∀ y ) R ( x , y ) ) ) Goal

Complete the following derivation: ⋮ n. ( ( ∀ x ) ( ∀ y ) ( P ( x ) → R ( x , y ) ) → ( ∀ x ) ( P ( x ) → ( ∀ y ) R ( x , y ) ) ) Goal class=

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