#contradiction

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Which of these sentences is a contradiction, that is, false on every valuation?

$\lnot(A \lor A)$ 1
$[(A \land B) \leftrightarrow B] \to (A \to B)$ 2
$(A \land \lnot A) \to (B \lor C)$ 3
$A \leftrightarrow [A \to (B \land \lnot B)]$ 4

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