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Is this a tautology?
(A ⟺ B) ⟺ ¬((A⇒B)⇒¬(B⇒A)) (A\iff B) \iff \neg ((A\Rightarrow B) \Rightarrow \neg(B\Rightarrow A) ) (A⟺B)⟺¬((A⇒B)⇒¬(B⇒A))
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