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Exercise logic.propositional.dnf.unicode
Description
Proposition to DNF (unicode support)
Derivation
Final term is not finished
¬(¬q ∨ ¬¬p) ↔ (¬s ∨ (r ↔ s))
⇒
logic.propositional.notnot
¬(¬q ∨ p) ↔ (¬s ∨ (r ↔ s))