Exercise logic.propositional.consequence
Description
Prove that formula is a logical consequence of a set of formulas
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p <-> r, q <-> s => (((p /\ q /\ r /\ s) || ~(p /\ q)) /\ p /\ q /\ r /\ s) || (((p /\ q /\ r /\ s) || ~(p /\ q)) /\ ~(r /\ s))
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