Finding the principal disjunctive normal form (PDNF) of a Boolean expression

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Find the principal disjunctive normal form (PDNF) of a Boolean expression $$((p\wedge q) \rightarrow r)\vee((p\wedge q)\rightarrow \neg r).$$ I tried by expanding it but I am stuck with the expression $(\neg p \vee \neg q \vee r) \vee (\neg p \vee \neg q \vee \neg r)$. I don't know how to convert them into min terms. Please help me.