Question on Button Sets

I have a set of 5 buttons on a slide with a variable set to "Visited" when the user has clicked each button. 

How can I make a trigger that only allows them to advance to the next slide once every button has been clicked or "visited"? The condition dialog shows each button separately, but I need to apply the variable to the whole set.

I thought this would be simple but I'm having trouble getting this to work.

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