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)) /\ ((p /\ q /\ r) || ~(r /\ s)) /\ (s || ~(r /\ s))
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