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new ((F β†’ B) β†’ B) β†’ (C β†’ (F ∧ E β†’ (((E β†’ B) β†’ C) β†’ (D ∨ F β†’ (B ∧ C β†’ (B ∧ A β†’ B))))))
intro
intro
intro
cases 2
intro
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cases 7
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cases 10
cases 2
cases 7
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exact 8