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Require Import Btauto.
Open Scope bool_scope.
Lemma test_orb a b : (if a || b then negb (negb b && negb a) else negb a && negb b) = true.
Proof. btauto. Qed.
Lemma test_xorb a : xorb a a = false.
Proof. btauto. Qed.
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