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intersection of 2 arrays

I never seem to have the problem at the time when it is being discussed 
here since I remember something about this in the past.

I have 2 arrays and would like a 3rd that contains the set intersection of 
the 2. Each element in each is unique. 

This seems like a basic function but after searching in help, etc. I didn't 
come up with an elegant solution. Maybe its too basic and I should know it?