Variables and the Next button

I have 3 buttons on a page. Each button opens a layer. I want the users to click all three buttons to see each layer before moving to the next slide. If the user does not click all 3 buttons, they should see the Incomplete slide layer.

Right now the only time the user sees the Incomplete slide is when they click Next before clicking any buttons. If they click one button, they can click Next and not see the Incomplete layer.  

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