So I'm given the starting case of; $$ (p \wedge \neg (q \vee \neg r)) \vee s) $$ and after applying De Morgan's Law, Compliment Law and Distributive law I think I can achieve CNF by; $$ (p \wedge (\neg q \wedge \neg \neg r)) \vee s \\ (p \wedge (\neg q \wedge r)) \vee s \\ (p \wedge \neg q \wedge r) \vee s \\ (s \vee p) \wedge (s \vee \neg q) \wedge (s \vee r) $$ So assuming that's correct, I do not know how to get the starting case in DNF. Or convert CNF to DNF. My notes from the lecturer give the exact same steps to get CNF and DNF from the starting case, so I am confused.
Any help would be great!