Exercise logic.propositional.consequence
Description
Prove that formula is a logical consequence of a set of formulas
![](http://ideas.cs.uu.nl/images/external.png)
p <-> r, q <-> s => (p /\ q /\ r /\ s /\ ((p /\ q /\ r /\ s) || ~(r /\ s))) || (~(p /\ q) /\ ((p /\ q /\ r /\ s) || ~(r /\ s)))
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