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**Simple Logic Question of Converting "or" to "and"**

**1. Homework Statement**

As the title would have you believe it's really just a basic question.

I have to write (¬q <---> r) /\ (¬p \/ ¬r) ---> (p \/ ¬q) just using "¬'s" and "/\'s" i know how to change everything else, but i cannot, for the life of me remember the equivalent of (a \/ b) in terms of nots and and gates.

**2. Homework Equations**

n/a

**3. The Attempt at a Solution**

Someone please help,