Exercise logic.propositional.dnf.unicode

Description
Proposition to DNF (unicode support)

Derivation

Final term is not finished

¬((¬q ∧ ¬q) ∨ p) ↔ (¬¬(r ↔ s) ∨ ¬¬((r ∧ s) ∨ (¬r ∧ ¬s)) ∨ ¬s)